Plaintiff appeals from a judgment for defendant in an action to establish the paternity and to provide for the support of her child. Plaintiff’s child was born July 29, 1954, nine days after the entry of a final decree of divorce dissolving her marriage to Thaddeus Kusior.
It appears from the settled statement that plaintiff and her husband separated in February, 1953, and that an interlocutory decree of divorce was secured in July, 1953. The child was probably conceived in October or November, 1953.
Both plaintiff and her husband testified that sexual relations between them ceased at the time of separation. However, Mr. Kusior exercised his right to visit their 8-year-old daughter at regular intervals. On these occasions, he would perform maintenance work on the property, and he took plaintiff and their daughter out to dinner on at least one occasion. Several times he remained in plaintiff’s home until the early hours of the morning. Plaintiff testified: “I had to have someone to talk to. Yes, we sat and talked until 3 or 4 in the morning.” Mr. Kusior continued these visits even after their daughter was sent east on a visit in May, 1954, but plaintiff had long since been pregnant at that time.
Two neighbors testified that Mr. Kusior was seen by them, sometimes in the evenings, during the period of possible conception. They were unable to say whether he stayed all night but did state that plaintiff and her husband did “not live together” after the separation.
Mrs. Nelson lived in the house as a roomer until some time in October. She testified that plaintiff did not live together with any man during that period, although she did see one man, not Mr. Kusior, both in the evening and the following morning. There were, however, as many as 10 men who visited plaintiff; they would sit with her in the den and sometimes bring groceries. Mrs. Nelson also saw one man leave amidst a commotion at 4 o’clock one morning.
Plaintiff testified that she first had intercourse with defendant early in June, 1953, and subsequently about four more times until she underwent an operation in September of that year. She testified that she had intercourse with defendant several times thereafter. He slept in the den the first time *607 he came to her house, about the middle of October, 1953, shortly after Mrs. Nelson moved out of the house. Mrs. Nelson testified that she never saw defendant until her appearance in court.
Plaintiff also testified that she went out with other men during the period of possible conception, and also frequented a certain cocktail bar. She stated, however, that defendant was the only man with whom she had intercourse.
Blood tests were taken of the parties pursuant to section 1980.3 of the Code of Civil Procedure. These tests established that plaintiff’s husband could not have been the father of the child but that defendant was within the class of persons who could have been.
The sufficiency of the evidence to support a judgment for defendant is not disputed, but plaintiff contends that certain instructions involving the effect of the blood tests and the presumptions of legitimacy were in error, and could have caused the jury to dispose of the proceedings by improperly determining that Mr. Kusior must be considered to be the child’s father.
The trial court gave instructions based on the following sections of our code, which set forth conclusive and rebuttable presumptions of legitimacy. Code of Civil Procedure, section 1962, subdivision 5, provides: “Notwithstanding any other provision of law, the issue of a wife cohabiting with her husband, who is not impotent, is indisputably presumed to be legitimate.” Section 1963, subdivision 31, sets forth as a disputable presumption: “That a child born in lawful wedlock, • there being no divorce from bed and board, is legitimate.” Civil Code, section 193, provides: “All children born in wedlock are presumed to be legitimate.” Section 194 makes that presumption applicable to all children born within 10 months of the “dissolution of the marriage.” Section 195 provides that the only persons who can dispute that presumption are the state in an action for support under section 270 of the Penal Code, or the “husband or wife, or the descendant of one or both of them. ’ ’
The instructions given to the jury based on these sections were to the effect that a conclusive presumption, which none of the other evidence in the case can contradict, would apply if there was a failure to show that there was not “a reasonable possibility of access.” The jury was also instructed that if they found that the conclusive presumption did not apply, then only the rebuttable presumption applies, and any evi *608 dence, including the blood tests, might be considered to rebut it. The relevant instructions are set forth below. 1
Appellant contends that the instructions defining the scope of the conclusive presumption were too broad in that “co
*609
habiting, ’ ’ as used in subdivision 5 of section 1962 of the Code of Civil Procedure, should properly be construed as “the living together of a man and woman ostensibly as husband and wife”
(Estate of Mills,
Estate of Mills, supra,
Respondent argues that this definition is not necessarily conclusive because in
Mills
the court was dealing with a case where the spouses were admittedly living together, and the
*610
court was not called upon to consider whether the word “cohabiting” might have a more extensive meaning.. However all doubt on this score was resolved by this court in its consideration of
Estate of Walker
on two successive appeals,
Taken together, the Mills and Walker cases clearly limited the application of the conclusive presumption of section 1962, subdivision 5, to cases where the parties were “living together . . . ostensibly as husband and wife”
{Mills)
or “living together in the same house or apartments”
{Walker)
and in all other cases applied only the rebuttable presumptions. No later case in this court departing from this rule has been cited to us.
Nelson
v.
Nelson,
Although a variety of meanings have been ascribed by various courts to the words “cohabit” and “cohabitation” (see e.g., 14 C.J.S. 1311-1312), their primary etymological meaning is living with or together, from the Latin “eo-” (“co-signifies in general with, together, in conjunction, jointly. ...” Webster’s New International Dictionary, 2d ed., unabr., p. 510) and “habitare, to dwell, to have possession of (a place). ...” (Id., p. 520, derivation of “cohabit”). “Cohabit” is defined in the same work (p. 520) as: “1. To dwell or abide in *612 company. Archaic. 2. To dwell or live together as husband and wife. In the United States at the common law, marriage is presumed when a man and woman have cohabited permanently together, being reputed by those who know them to be husband and wife, and admitting the relationship. ...”
Our courts so defined the words in determining the statutory requirement of a “common-law (i.e., nonceremonial) marriage” under the former section 55 of the Civil Code, which required “a mutual assumption of marital rights, duties, or obligations.” In
Kilburn
v.
Kilburn,
The definition of “cohabiting” adopted in the Mills case and confirmed in the second Walker case has been since accepted and followed by the District Courts of Appeal in the following cases:
Hilton
v.
Hilton,
Respondent relies particularly upon
Williams
v.
Moon,
It is noteworthy that the earliest of these cases,
People
v.
Kelly,
Following the decision in
Kelly,
the case of
Williams
v.
Moon, supra,
That
Kelly
was a feeble reed upon which to lean is clear from our discussion of that case.
Dazey
v.
Dazey, supra,
In
People
v.
Hamilton, supra,
The language “not wholly absent” obviously refers to appellant’s testimony that “he was absent during the time of conception.” It cannot reasonably support the conclusion that the court by this language was intending to enlarge the definition of “cohabiting,” so long settled by our decisions.
We conclude that insofar as
Williams
v.
Moon, supra,
We conclude that the trial court committed error in instructing that the conclusive presumption applies if the husband had “access” or “reasonable possibility of access” to his wife during the period of conception.
Appellant also contends that the instructions with regard to the conclusive presumption should not have been given at all in view of the fact that the blood tests showed that her husband could not have been the father. She argues that the conclusive presumption is subject to well-reeognized exceptions, and that blood tests should be added to the exceptions. She relies principally on the explanation for the exceptions set forth in
Estate of McNamara, supra,
Appellant cites the scientific reliability of blood-grouping tests (see concurring opinion of McComb, J., in
Berry
v.
Chaplin,
The judicial decisions prior to the adoption of the Uniform Act in 1953 have a direct bearing on the present problem. In
Aráis
v.
Kalensnikoff,
Statutes are to be interpreted by assuming that the Legislature was aware of the existing judicial decisions. (See 45 Cal.Jur.2d 615, 616.) Moreover, failure to make changes in a given statute in a particular respect when the subject is before the Legislature, and changes are made in other respects, is indicative of an intention to leave the law unchanged in that respect.
(Cole
v.
Rush,
Moreover, section 1962, subdivision 5, was amended in 1955 by the addition of the emphasized words: “Notwithstanding any other provision of law, the issue of a wife cohabitating with her husband, who is not impotent, is indisputably presumed to be legitimate.” This addition was part of an act which gave the state power to dispute the rebuttable presumption by adding the state to the parties enumerated in Civil Code, section 195, and also by adding a provision to Penal Code, section 270, to the effect that the state could prove nonaccess “or any other fact establishing nonpaternity of a husband.” Since the people have been equated with all others who may rebut presumptions, it is apparent that they and all others were not meant to be able to use this section, or any other provision of law, as against section 1962, subdivision 5. It is further apparent that blood tests are one of the ways in which paternity could be disputed other than noninter *619 course, and that the overall legislative intent manifestly precludes any other construction of the statutes.
Appellant contends that such a construction is not consistent with constitutional principles in that there is no reasonable relationship between the presumption and the fact sought to be presumed in a ease in which there is scientific evidence to the contrary.
(Kirchhubel
v.
Munro,
Appellant’s final contention is that the trial court was in error in instructing the jury that the blood tests were not conclusive as against the rebuttable presumption but were only evidence to be weighed with all the other evidence. A similar argument was rejected in
McKee
v.
McKee,
We conclude that the result of blood tests taken under the Uniform Act (Code Civ. Proc., § 1980.1 et seq.) may not be used to controvert the conclusive presumption of paternity created by subdivision 5 of section 1962 of the Code of Civil Procedure, but that under the language of section 1980.6, if “the conclusions of all the experts . . . are that the alleged father is not the father of the child, the question of paternity shall be resolved accordingly,”
5
where the tests so taken establish that the mother’s husband could not be the father of. the child the rebuttable presumptions of paternity are conclusively- rebutted. The dictum in
McKee
v.
McKee,
*621
supra,
The jury after deliberating returned to court and asked to be reinstructed on the effect of the presumptions of legitimacy. After being so instructed, they returned shortly with their verdict. Under the circumstances the prejudice from the error in defining “cohabiting” seems clear.
The judgment is reversed.
Gibson, C. J., Traynor, J., Schauer, J., McComb, J., Peters, J., and White, J., concurred.f
Notes
“Now, you will observe there are two conditions which must exist and which you must find to exist before this conclusive presumption applies: ‘ The issue of a wife cohabiting with her husband, who is not impotent. ’
‘ ‘ There is no question that Mrs. Kusior was married to Mr. Kusior, so she is a wife, but you must find that she cohabited with him during the period of conception involved in this ease.
“You must also find that Mr. Kusior is not impotent. Prom the uncontradieted evidence in this ease, you may accept as a fact that Mr. Kusior is not impotent; that is to say, he could father a child.
“So, then, the only question remaining for you to determine from the preliminary facts, is whether Mr. and Mrs. Kusior cohabited at any time and for any time during the period that conception must have taken place according to the laws of nature in this case.
“Hence, to invoke the conclusive presumption just read you, you need only find that Mr. and Mrs. Kusior cohabited, that is, at any time and for any time, lived together as husband and wife during the period when conception normally would have occurred in this case, or if you find from the evidence that Mr. Kusior, the husband, had access to his wife, Mrs. Kusior, during that period of conception involved here.
“There is evidence that the Kusiors had separated and had no sexual relations since or during the separation, but separation alone is not the test.
“To prevent this strong conclusive presumption from arising, where the child is conceived during marriage, which is the ease here, the evidence must be clear and convincing that there in fact was no access; not simply that the parties were separated. If there was reasonable possibility of access, the conclusive presumption arises, and no evidence can be considered by you to contradict it.
“In that situation, the child is conclusively presumed to be legitimate and your verdict would have to be for the defendant, Dr. Silver.
“But, on the other hand, should you find that there was in fact no cohabitation by Mr. and Mrs. Kusior during the period in which conception normally would have occurred in this case, the conclusive presumption would not apply, but only the rebuttable presumption which was the one to the effect that a child born of a married woman within ten months after the dissolution of her marriage is presumed legitimate.’’ (Court’s Instruction “A.”)
“You should bear in mind that if you find the fact of cohabitation existing between Mr. and Mrs. Kusior during the period of conception in this case the conclusive presumption applies and you may not consider any of the evidence in the ease for the purpose of contradicting that presumption.
“But, if you find that it does not apply, and only the rebuttable presumption applies, then you may consider all the evidence in accordance with these instructions.” (Court’s Instruction “B.”)
‘ ‘ There is another presumption which applies, depending as to whether you find certain preliminary facts to exist. That presumption says: ‘ The issue of a wife cohabiting with her husband, who is not impotent, is indisputably presumed to be legitimate. ’ That presumption cannot be contradicted, if it applies.” (Court’s Instruction “C.”)
‘ ‘ The law throws certain protections around a family and the children of the family, for obvious reasons.
“There is a presumption established by law which says that all children of a woman who has been married, bom within ten months of *609 the dissolution of the marriage, are presumed to be legitimate children of that marriage.
"This presumption, which is rebuttable, applies in this instance.
"The child was born of a woman who had been married, bom nine days after the dissolution of the marriage.
"As I say, the presumption is rebuttable, and you may apply, either in support of or contradiction of this presumption, any of the evidence that has been received in this case, including the two blood tests." (Court’s Instruction "E. ”)
Pertaining to the results of the blood tests, the court instructed the jury as follows: "The doctor’s report of the results of the blood tests made of the parties to this action, and of the minor child Dorothy, does not establish that the defendant is the father of the minor child Dorothy. It merely establishes that the defendant is one of that group of men whose blood is such that, physiologically, any one of them could father a child having blood such as Dorothy, so that therefore it is physiologically possible for the defendant to be Dorothy’s father. This report is to be considered by you, together with all of the other evidence presented in this ease, in resolving the issue of whether the defendant is the father of the minor child Dorothy. The other report, you will reoail¡ gave its interpretation of the findings that Thaddeus Kusior was excluded from the class of those who could be the father of the child.” (Court’s Instruction "E.’’)
Some of the confusion in the later cases may be due to the use of the language in this decision: “(that is, if there was coition and no impotency), no inquiry will be permitted into the probabilities Of the case one way or the other, but the presumption of legitimacy is conclusive. ’ ’ A reading of the entire opinion makes it clear that the holding of the court was that the conclusive presumption created by section 1962, subdivision 5, only applies if the husband and wife were living together, and that the rebuttable presumption otherwise applicable may be overcome by proof of nonintereourse; but if the fact of intercourse is found by the court or jury, the rebuttable presumption is not overcome, i.e., in the language of the court, becomes “conclusive.” See e.g.,
The court then, at
The court in second Walker adopted the majority view thus expressed in Euling Case Law and stated at 180 Gal. 491-492: “It should perhaps be noted that when it is said that the presumption of legitimacy is conclusive if it were possible by the laws of nature for the husband to be the father, it is not meant that the proof of the fact of such impossibility must itself be beyond possibility of doubt. . . . The presumption of legitimacy is strong and the proof of . . . nonintercourse must be clear and satisfactory, but this is all. The presumption does not operate to change the general rule that in civil eases the issue is to be determined upon the preponderance of evidence, but like other presumptions operates under and beneath that rule.”
It is significant that in
Mills,
137 California at page 301, this court cited 1 Bishop on Marriage, Divorce, and Separation, section 1669, note 1, in support of its definition of “cohabiting,” and that the first case cited by Bishop in this footnote is
Yardley’s Estate,
75 Pa. St. 207. In
Kilburn
v.
Kilburn,
A common use of the noun ‘ ‘ cohabitation ’' is found in the statement of this rule of evidence relating to the proof of marriage. “The fact of cohabitation as man and wife, by itself, raises a presumption of a legal marriage; and this is particularly so after a long interval of time; thus such cohabitation must be continuous and consistent to sustain the presumption.” (1 Wharton, Law of Evidence, 3d ed. (1888), $ 84, pp. 84- *613 85; of. 2 Kent’s Commentaries, 14th ed. (1896), p. 87, note (x) (b) : “Cohabitation and repute are evidence of marriage”; 7 Wigmore on Evidence, 3d ed. (1940), § 2083, pp. 427-431, quoting (at p. 428) Lord Westbury in the Breadalbane Case (LB. 1 Sc. App. 182) : “Cohabitation as husband and wife is a manifestation of the parties having consented to contract the relationship ‘ inter se. ’ It is a holding forth to the world by the manner of daily life, by conduct, demeanor, and habit, that the man and woman who live together have agreed to take each other in marriage . . .”; 1 Jones on Evidence, 5th ed. (1958), §16, p. 33, §94, p. 165, §95, pp. 166-167; 35 Am.Jur., Marriage §§220-221, pp. 326-330. See 32 Cal.Jur.2d, Marriage, § 34, pp. 364-367, collecting the California cases in the footnotes.)
This rule of evidence was already settled in California at the time of the original adoption of the codes in 1872. (People v.
Anderson
(1864),
The quotation from first Walker,
There appears to have been only one test made in this case of the hlood of the husband. Since section 1980.6 speaks of “the conclusions of all the experts,” it would seem that more than one expert must make the tests and agree upon the results to require that “the question of paternity shall be resolved accordingly. ”
(State
v.
Sargent,
