This appeal concerns the custody of a three-year-old girl, L.L.B.
Appellant, J.B., and appellee, D.B., were married in August of 1982. L.L.B. was born on May 6, 1984. On August 9, 1984, appellant filed a complaint in divorce. Following a final separation of the parties in December of 1984, appellant and L.L.B. resided with appellant’s mother. Appellee visited L.L.B. during 1985, and on July 15, 1985, appellee filed a petition seeking partial custody of the child. On November 26, 1985, an agreed order granting custody of L.L.B. to appellant and partial custody rights to appellee was entered into by the parties and approved by the Court of Common Pleas of Philadelphia.
On May 28, 1986, appellant filed a petition to modify the custody order. In this petition, appellant asserted that a substantial change in circumstances had occurred following *531 the entry of the agreed custody order of November 26, 1985. Specifically, appellant alleged that her suspicion that her husband, appellee herein, was not the natural father of L.L.B. had been confirmed, and that “one P.B. has been shown to be the natural father by blood test.” Further, appellant asserted that it would be in the best interests of L.L.B. to have no time with appellee because “the child is more familiar with P.B.” than with the appellee and appellant “is engaged to marry P.B.” 1 Following a hearing on the matter, the trial court denied appellant’s petition to modify the custody order of November 26, 1985, finding that appellant had failed to establish a substantial change in circumstances since the entry of that order. The appellant argues on appeal that the trial court erred in its conclusion that the facts presented before the court were not sufficient to constitute a substantial change in circumstances, thus warranting a reconsideration of the existing custody order.
Our supreme court has recently enunciated the appropriate standard of review in custody matters. In
Lombardo v. Lombardo,
We have recognized that the trial judge is in a position to evaluate the attitudes, sincerity, credibility, and demeanor of the witness. Because we are not in such a position, we have recognized that a trial judge’s determination' of custody should be accorded great weight. Only where we are constrained to hold that there was a gross abuse of discretion should an appellate court interfere with the decisions of the hearing judge.
Thus, in the case before us, we must determine whether the trial court’s “incontrovertible factual findings support the trial court’s factual conclusions, but may not interfere with those conclusions unless they are unreasonable in light of the trial court’s factual findings ... and thus represent a gross abuse of discretion.”
Lombardo, supra,
In order to justify a court’s reconsideration of a valid prior custody order, the burden rests upon the party seeking modification of that order to prove a substantial change in circumstances following entry of the prior order.
Daniel K.D. v. Jan M.H.,
In the case before us, the trial court determined that appellant had failed to prove a substantial change in circumstances following entry of the November 1985 custody order. Although blood tests taken in the spring of 1986 further convinced appellant that P.B. is L.L.B.’s natural father, the trial court found that appellant had believed that P.B. was the natural father of her child even during her pregnancy when she was married and living with appellee. 2
Appellant testified that in July of 1983, when she was separated from appellee for a period of one and one-half weeks, she engaged in sexual relations with P.B. (N.T. at 15a and 44a). Nine months later, L.L.B. was born. The trial court specifically noted appellant’s testimony that when she first saw L.L.B., she believed she looked like P.B. (N.T. at 20a). Appellant testified that throughout 1984 and 1985, she felt that the father of the child was P.B. (N.T. at 23a). Thus, the changed circumstance since the entry of the agreed custody order of November 26, 1985 has been appellant’s decision to seek to prove in court that her suspicions regarding the paternity of P.B. are correct and not a new discovery that appellee may not be L.L.B.’s natural father. The only other change in circumstance found by the trial court is appellant’s intention to marry *534 P.B. upon her divorce from appellee. Opinion of Trial Court at 4. We agree with the trial court that appellant has failed to prove any substantial change of circumstances as would warrant a reconsideration of the November 26, 1985 custody order.
This case can be readily distinguished from those cases where a substantial change in circumstances warranting re-examination of an existing custody order has been found. In
Parker v. MacDonald,
The case at bar presents none of the factors which existed in
Parker
and in
Espersen.
Neither the appellant nor the appellee has changed residence since the agreed
*535
custody order was entered on November 26, 1985. Appellant and L.L.B. continue to reside at the home of appellant’s mother. Neither party has remarried because their divorce proceeding is pending. Moreover, there is no evidence in the record to suggest that either party has made any changes in their respective lifestyles. Significantly, appellant was unable to establish that appellee was unfit to have partial custody of L.L.B. or that appellee’s visits with L.L.B. have become upsetting or harmful for the child since November of 1985. On the contrary, appellant has merely alleged that appellee’s partial custody of L.L.B. may have an adverse effect on the child sometime in the future when the child is older. Appellant testified that she was upset about “... the confusion that is going to come about with her when she gets older when she going to ask me questions: well, Why do I see David? Why do I see daddy? and I have to go and tell her that, well, I was married to David____” N.T. at 75a. Finally, appellant’s plans to remarry do not require a re-examination of this custody order. This court has held that even where parties do remarry following the entry of a custody order, remarriage per se is not sufficient to warrant reconsideration of the custody order.
Daniel K.D. v. Jan M.H.,
Finally, appellant argues that the trial court erred because it refused to consider the evidence of blood tests challenging the paternity of the appellee in determining whether there had been a substantial change in circumstances. We disagree. The opinion of the trial court shows that the court did consider this evidence in reaching its decision. The court concluded, despite the blood tests, that the circumstances surrounding L.L.B. and her parents had not substantially changed following the November 1985
*536
custody order. Even though appellant continued to doubt the paternity of the appellee, as she had since 1983, the trial court correctly recognized that the appellee is presumed to be the natural father of L.L.B. because she was born during the marriage of the parties.
See Connell v. Connell,
Appellee argues in his brief that based on the decision of our supreme court in
Adoption of Young,
For the foregoing reasons, we find no abuse of discretion by the trial court in dismissing appellant’s petition to modify custody order on the grounds that appellant has failed to establish a significant change in circumstances. This Court has recognized that by imposing upon a party challenging an existing custody order the initial hurdle of showing changed circumstances, the “doctrine of
res judicata
is adhered to without unduly prejudicing the interest of either parent or child.”
Espersen v. Davidow, supra.
In reaching our decision, we emphasize that appellant is in no way precluded from petitioning the trial court to terminate the parental rights of appellee on the grounds that he is the presumptive but not the natural father of L.L.B.
See
Pa.C.S.A. § 2511(a)(3). In his dissenting opinion in
Adoption of Young,
Order affirmed.
Notes
. At the hearing on September 12, 1986, appellant orally amended her petition to assert, in addition, that appellee was unable to handle the care of the child correctly and that he was unfit to have custody of the child. The trial court, in its opinion, specifically found that appellant had failed to establish that appellee was a harmful influence on L.L.B. or that his relationship with the child had changed since entry of the agreed custody order. Opinion of Trial Court at 5. Appellant has not raised any issue in her Brief with reference to the disposition of her oral amendment by the trial court. As a result, we need not address this issue.
. The parentage testing report issued by the Penn Jersey Regional Red Cross Blood Service states that P.B. is not excluded as the father of L.L.B. The report also states that the probability that P.B. is the father of L.L.B. is "99.898% as compared to a random man.” The appellee, D.B., has not submitted to blood testing. We note that 42 Pa.C.S.A. § 6136 provides that if all experts agree that blood test results
exclude
an individual as a possible father, then the question of paternity is conclusively resolved. However, in
Turek v. Hardy,
