Ann and Henry Davidson were divorced by a judgment which was entered as absolute on the docket of the Barnstable County Probate Court on September 7, 1976. By the terms of that judgment, Henry was ordered to pay $40 per week for the support of the parties’ two minor children, custody of whom was given to Ann, and $10 per week as alimony for a period of two years. In addition, Henry was ordered to convey to Ann his interest in the marital home. 1 On November 29, *366 1978, Ann filed a complaint for modification, which was twice amended. On March 5, 1981, she filed a complaint, later amended, seeking assignment of marital property under G. L. c. 208, § 34. The actions were tried together. The judge filed comprehensive findings of fact and conclusions of law. A judgment of modification was entered ordering, among other things, Henry to pay $125 per week for the support of the minor children 2 and lump sum alimony of $15,000. A second judgment was entered ordering Henry to pay Ann $45,000, “as a division of marital property,” and $13,500 as counsel fees. Henry has appealed from the latter judgment, from so much of the former which awards Ann lump sum alimony, and from the denial of his motion for a mistrial.
1. The Judgment of Modification.
Henry says that the judge’s findings show clear error in three respects. First, he argues that the judge placed undue emphasis on the fact that Henry was a life income beneficiary (in the discretion of the trustees) of an unfunded trust under the will of his mother. The judge’s findings clearly indicate that she considered that the trust was not funded and might never be. Moreover, Henry’s current circumstances, as found by the judge and not disputed, apart from any future income which he might receive from the trust, fully support the amount of the award made. Henry next contends that the judge failed to take into account income which Ann earned as a private duty nurse in the finding as to her average weekly earnings. That finding involved an assessment of the credibility of Ann’s testimony, which was for the judge to make. Henry’s final claim — that there was clear error in the judge’s finding that Ann had no opportunity for the future acquisition of income other than through her earnings as a registered nurse — is patently without merit.
The detailed findings of the judge are more than sufficient to establish the material change in circumstances necessary to
*367
support a judgment of modification under G. L. c. 208, § 37.
See Robbins
v.
Robbins,
2. The Judgment Under G. L. c. 208, § 34.
(a)
Res judicata.
Henry argues that Ann was precluded from seeking an assignment of property by the judgment of divorce. We have no record of the divorce proceedings other than the judgment of divorce nisi, entered March 4, 1976, in which Henry was ordered to pay child support and alimony, and to convey his interest in the marital home to Ann. The judge who heard the divorce action made no findings of fact, undoubtedly because the judgment was entered before the Supreme Judicial Court suggested, and then required, findings on the statutory factors set forth in G.L. c. 208, § 34. See
Bianco
v.
Bianco,
“[Wjhere the property rights of the parties have not been previously adjudicated, the Probate Court, upon consideration and findings relative to the statutory criteria, . . . may assign property pursuant to G. L. c. 208, § 34 . . . after a judgment of divorce has become absolute” (citations omitted).
Maze
v.
Mihalovich,
We conclude, as did the probate judge, that the judgment of divorce did not preclude litigation of the issues raised in the subsequent complaint for the assignment of property under G. L. c. 208, § 34. 3
(b) Property subject to division. 4 Ann’s amended complaint alleged that at the time of the divorce Henry had (1) an irrevocable remainder interest under a testamentary trust of his deceased father which had, at the time of the complaint, vested in possession, and (2) an expectancy, under the will of his mother, which had ripened into an inheritance at the time of the complaint. There is no dispute as to the judge’s findings that at the time of trial Henry had received distributions from his father’s trust of about $141,000 and tangible personal property from his mother’s estate with a value of about $44,000. 5 It is also not in question that the judge considered at least these assets to be subject to division under G. L. c. 208, § 34.
*369
Henry contends that since these assets did not come into his possession until after the judgment of divorce absolute, they constituted “after acquired” property and were thus not part of his “estate” and subject to division under § 34. Ann counters that the Supreme Judicial Court in
Rice
v.
Rice,
Our consideration of the issue thus framed, one not heretofore considered by our appellate courts, begins with an examination of the nature of the rights afforded spouses under § 34. Without rehearsing in detail what has been said in our appellate cases which have treated the differences between traditional alimony and new division of property concepts (see e.g.,
Bianco
v.
Bianco,
None of the cases construing § 34 involved property interests . acquired after the dissolution of the marital partnership. The language in Rice v. Rice, supra at 400, “whenever and however acquired,” in context referred to separate property acquired by the husband before the marriage and as gifts during the marriage. Id. at 399-400. To hold that property interests acquired after the dissolution of the marriage are subject to division under § 34 would be contrary to the marital partnership concept on which § 34 is founded. See Inker et al., 10 Suffolk U.L.Rev. 4, n.10. We conclude, therefore, that the property interests of Ann and Henry which were subject to division under § 34 were to be identified as of the time of their divorce. 9
*371 We turn then to the interests (as they existed at the time of the divorce) which Ann identified in her amended complaint under § 34, and on which the parties seem to have focused at trial: (1) Henry’s remainder interest under his deceased father’s testamentary trust; and (2) Henry’s expectancy under the terms of his living mother’s will.
At the time of the divorce in 1976, the following were the operative facts. Under the terms of the testamentary trust of Henry’s father, Henry’s remainder interest would be distributed free of trust when his mother died and when he reached age 35. Henry was about 33 years old and his mother was alive. The trustees were empowered “in their uncontrolled discretion” to invade principal for the benefit of Henry’s mother. The value of the remainder interest was, therefore, uncertain and actuarial calculations would be to no avail. In addition, the remainder was subject to a valid spendthrift clause and could not have then been reached by Ann in satisfaction of any judgment or claim. See
Bucknam
v.
Bucknam,
While “[pjroperty concepts have not become immaterial,”
Putnam
v.
Putnam,
*372 We conclude that Henry’s remainder interest under his father’s testamentary trust, while it may have been at the outer limits, constituted a sufficient property interest to make it a part of his estate for consideration in connection with a property division under § 34. Henry’s right to the remainder was fixed at the time of the divorce in 1976 (Henry’s father died about 1968. The record does not show when his will was admitted to probate.), subject only to the conditions of survivorship. We do not think that either the uncertainty of value or the inalienability of the interest, in themselves, are sufficient to preclude consideration of the interest as subject to division. 11 *373 We do not, of course, suggest that a judge must divide such an interest or assign it to the ledger of the holder in making a division of property. The determination whether to include a particular interest in the property to be divided lies within the sound discretion of the judge after consideration of all of the § 34 factors. 12
*374
Henry’s expectancy at the time of the divorce under the will of his mother stands on a different footing. The mother was alive (she died on January 30, 1979) and could have changed her will. There are practical reasons for a rule that generally excludes such expectancies from the definition of property subject to division under § 34. An attempt at some determination of the usual speculative quantum of an expectancy might well involve the lengthy trial of issues collateral to the § 34 action: the validity of a will, current and future testamentary capacity, valuation of the estates of others, familial relationships, and so forth. See
Krause
v.
Krause,
The judge’s findings indicate that she may have considered after-acquired property in determining Henry’s estate. She listed, for example, the home which Henry owned with his wife and tangible personal property which he inherited from his mother, and assigned values to them. It would have been helpful if the judge had separated her findings in the modification action from those in the § 34 action. (We urge judges to do so in the future.) To the extent that she considered after-acquired property in the § 34 action, there was error. See
Hay
v.
Cloutier,
(c)
The G. L. c. 208, § 34 factors.
14
As of what date are the § 34 factors to be applied? For the reasons discussed in part 2(b) above, we think that the marital partnership concept embodied in § 34 dictates that in this case the factors be examined as of the date of the divorce.
15
The focus of the
*376
commentators and, to some degree, our appellate cases, has been on the recognition by § 34 of a wife’s service contributions to the marital partnership. The underpinning of any order for division of property under § 34 is, however, the judge’s consideration of the contributions, in the statutory terms, of each spouse, as well as other factors in existence at the dissolution of the partnership which have been traditionally applied in determining alimony.
16
See
Bianco
v.
Bianco,
The judge made findings on many of the § 34 factors, for example, age, health, station, occupation, amount and sources of income, estate, liabilities, needs, and opportunity for future acquisition of capital assets and income, on the basis of the situation of the parties at the time of trial. The conclusion is inescapable that the judge in substantial part based § 34 relief on those findings. To the extent that she did so, there was error; and the judgment must be reversed. 17
(d) Valuation of property subject to division. Where the division of property under § 34 takes place, as here, after the divorce, the property subject to division is to be valued as of the date of the order for division. Henry does not argue to the contrary. Thus, the parties equitably share in any appreciation or depreciation in the value of the property. The results are no different from those which follow from a division at the time of a divorce, except that in the latter case each spouse may have some control oyer the economic vicissitudes of the property which is assigned to him or her. Of course, the principles *377 which apply to after-acquired property may come into play with respect, for example, to improvements to real estate to which an increase in value may fairly be attributed, or additions to stock holdings, as opposed to stock splits or dividends. No such considerations have been shown to exist here. The judge was correct in valuing Henry’s remainder interest under his father’s testamentary trust on the basis of the distributions from the trust which Henry had received at the time of trial.
3. The Motion for Mistrial.
Henry’s wife, Donna, was called as a witness by Ann; Donna had not been subpoenaed. She testified on direct examination on May 19 and June 9, 1981. On June 25, 1981, Ann filed a motion to join Donna as a defendant, pursuant to Mass.R.Dom.Rel.P. 19(a) (1975). Thereafter, Donna’s attorney advised her not to return to Massachusetts from Maryland, where she lived with Henry, and she did not do so. On July 14, 1981, Henry’s motion for a mistrial, on the ground of his inability to cross-examine Donna, was denied. The trial ended on July 15, 1981. On September 17, 1981, Ann’s motion to join Donna as a party was denied.
Since there must be a new trial on the complaint under G. L. c. 208, § 34, we consider the denial of the motion for mistrial only as it related to the action for modification. In this respect, Henry’s argument on appeal that Donna’s testimony formed the basis for the judge’s findings as to his “financial situation” ignores the ample evidence from other sources, including Henry’s own testimony, on which the judge could have based her findings on material change of circumstances.
18
Henry did not seek relief less drastic than mistrial, as, for example, the striking of Donna’s direct testimony. In the almost ten months which elapsed from the denial of the motion to join Donna as a party and the entry of judgment, Henry did not move to reopen the trial for the purpose of cross-examining Donna. Moreover, Henry points to no particular prejudice from
*378
Donna’s direct testimony. The word “mistrial” is used to denote “such fundamental errors in a trial as to vitiate the result.”
C.W. Hunt Co.
v.
Boston Elev. Ry.,
4. Counsel Fees.
Henry’s only argument on this point is that the judge abused her discretion in ordering him to pay $13,500, as counsel fees for Ann, because he “lacks the financial status” to pay that amount. He does not argue that the record was inadequate reasonably to evaluate the services of Ann’s counsel, or that the award was not commensurate with the value of the services rendered. See
Ross
v.
Ross,
However, since the award was made as a part of the judgment under G. L. c. 208, § 34, and since we may assume it was based, at least in part, on the result which Ann’s counsel obtained in that action, we also reverse the judgment in this respect, so that the matter may be reconsidered in light of this opinion, and after a new trial on the § 34 complaint.
The judgment of modification is affirmed. The judgment pursuant to G. L. c. 208, § 34, is reversed.
So ordered.
Notes
Henry did not do so. Mortgage payments were substantially in arrears, and the mortgagee bank foreclosed a few days after the entry of the judgment of divorce nisi. Subsequently, Ann was ¿lowed to repurchase the home with funds borrowed from her father.
A temporary order had been entered on January 11, 1979, increasing child support to $90 per week. The judgment also ordered Henry to pay an arrearage of $3,815 under that order at the rate of $25 per week.
Res judicata is an affirmative defense which must be pleaded, Mass.R.Dom.Rel.P. 8(c) (1975). The docket entries do not indicate that an answer to or motion to dismiss the original or amended complaint for assignment of property was filed. No such pleading appears in the appendix. An answer was, of course, required. Mass.R.Dom.Rel.P. 7(a), 8(b) (1975). (There is no provision in the Rules of Domestic Relations Procedure for summary judgment). See
Dowd
v.
Morin,
“In addition to or in lieu of a judgment to pay alimony, the court may assign to either husband or wife all or any part of the estate of the other.” G. L. c. 208, § 34, as appearing in St. 1977, c. 467.
As to Henry’s interest under his mother’s testamentary trust and the judge’s findings with respect thereto, see part 1 of this opinion.
General Laws c. 208, § 34, as appearing in St. 1977, c. 467, applied to the trial of this case. See
Zildjian
v.
Zildjian,
Chief Justice Hennessey, the author of Rice, later commented: “In practical effect, the court [in Rice] in a liberal interpretation of [§ 34], treated the marriage as an implied partnership for the purposes of distribution of property. As in the case law dealing with family operated small businesses, the Rices’ marriage could be viewed as a pooling of resources, a co-ownership of the property brought to the marriage and acquired later.” Hennessey, Explosion in Family Law Litigation, Challenges and Opportunities for the Bar, 14 Family L.Q. 187, 189 (1980).
This article has been cited with approval in many cases construing § 34. See
Bianco
v.
Bianco,
In this case it makes no difference whether that property is identified as of the time of the divorce trial, the judgment nisi or the judgment absolute, as the situation was the same at all of those times. We intend no suggestion of a rule fixing any of those dates, or excluding some earlier time in appropriate circumstances, e.g., the date of the separation of the parties, as determinative in identifying divisible property. We think the development of the law in this respect is best left to a case-by-case analysis.
See part 1 of this opinion.
Other jurisdictions vary in their determinations as to what interests constitute property subject to division at divorce. (The starting point for analysis of any of the cases is the statute under which equitable division is allowed. See note 13,
infra.)
For instance, some States include nonpossessory remainders which are not subject to divestment. See e.g.,
McCain
v.
McCain,
Similarly, jurisdictions differ as to whether interests subject to contingencies may be equitably distributed. Some States exclude this species of interest as speculative and remote. See, e.g.,
Kroha
v.
Kroha,
There have also been cases dealing with the question whether a chose in action accruing during marriage constitutes property divisible at divorce. See and compare
Postill
v.
Postill,
For other cases which have considered interests with uncertain or speculative value, see and
compare Richardson
v.
Richardson,
This court has recognized that nonvested pension rights constitute property subject to division at divorce.
Dewan
v.
Dewan,
As will be seen later in this opinion, the question of valuation presents no problem in this case, since the division was made at a time when the remainder interest had vested in possession. In the case of such an interest which has not vested in possession at the time of trial of the § 34 issues, and where there is no spendthrift or other limitation and actuarial evidence as to valuation is available, guidance in crafting creative judgments may be found in cases dealing with pension interests. See
Dewan
v.
Dewan,
Massachusetts permits the equitable distribution of “all or any part of the estate of the other,” G. L. c. 208, § 34, which has been held to include gifts,
Rice
v.
Rice, supra
at 399-401, and inheritances,
Earle
v.
Earle,
“In determining the amount of alimony, if any, to be paid, or in fixing the nature and value of the property, if any, to be so assigned, the court . . . shall consider the length of the marriage, the conduct of the parties during the marriage, the age, health, station, occupation, amount and sources of income, vocational skills, employability, estate, liabilities and needs of each of the parties and the opportunity of each for future acquisition of capital assets and income. The court may also consider the contribution of each of the parties in the acquisition, preservation or appreciation in value of their respective estates and the contribution of each of the parties as a homemaker to the family unit.” G. L. c. 208, § 34, as appearing in St. 1977, c. 467.
As the situation of the parties was substantially the same at the times of the entry of the judgments nisi and absolute, we do not reach questions which may arise where property is acquired or circumstances, in the § 34 sense, change between the entry of the judgments nisi and absolute. See
Zildjian
v.
Zildjian,
We recognize, of course, that some or all of the contributions of spouses may have ceased well before the divorce.
In those situations where a judge after a divorce trial exercises discretion to reserve property division and retain jurisdiction, see note 12, supra, the judge should, nevertheless, make written findings on the § 34 criteria at the time of trial, so that they may be used by the judge who subsequently hears the § 34 case.
In addition, according to the docket entries, the judge had financial statements of both parties. Those statements are not reproduced in the appendix.
