OPINION
M.N.G.’s paternal grandmother appeals a trial court order denying modification of conservatorship in a suit affecting the parent-child relationship. This appeal raises the issue of whether the United States Supreme Court decision in
Troxel v. Granville,
FACTUAL BACKGROUND
M.N.G.’s father and mother were divorced on January 13, 1989. Father was named sole managing conservator of their son, M.N.G., who was then two years old. However, Father voluntarily left M.N.G. with M.N.G.’s grandmother after the divorce, and M.N.G. lived with his grandparents from that time until the time of trial, when he was fourteen years old.
With the exception of one $50 payment, neither the father nor the mother provided the grandparents with any financial support for M.N.G. Due to lack of financial support from the parents, Grandmother obtained financial support from the State for M.N.G., including Medicaid and food stamps. On October 24,1996, the Office of the Attorney General of the State of Texas filed a Notice of Change of Status and Motion for Further Orders, seeking that child support payments be made by M.N.G.’s father and mother to Grandmother, with whom M.N.G. was living.
Grandmother filed a Petition in Intervention, seeking to modify the original custody decree to appoint her as M.N.G.’s sole managing conservator. M.N.G. filed an affidavit with the court stating that he chose Grandmother as his managing conservator. Father opposed the modification of the decree and sought return of the child to him. Following a final hearing, the trial court rendered its final order February 15, 2001, denying Grandmother’s request for modification and ordering that M.N.G. be surrendered to Father immediately.
THE MODIFICATION STATUTE
When the family code was originally enacted in 1973, modification of sole managing conservatorship was measured by the test of a material and substantial change in circumstances, coupled with a best interest test. Act of May 25, 1973, 63rd Leg., R.S.,
*30
ch. 543, § 14.08, 1973 Tex. Gen. Laws 1411, 1425;
Bates v. Tesar,
The terms of the modification statute at the time of trial as set forth in the family code provided as follows:
§ 156.101. Grounds for Modification of Sole Managing Conservatorship
(a) The court may modify an order that designates a sole managing conservator of a child of any age if:
(1) the circumstances of the child, sole managing conservator, possessory conservator, or other party affected by the order have materially and substantially changed since the date of the rendition of the order; and
(2) the appointment of the new sole managing conservator would be a positive improvement for the child.
(b) The court may modify an order that designates a sole managing conservator of a child 10 years of age or older if:
(1) the child has filed with the court in writing the name of the person who is the child’s choice for managing conservator; and
(2) the court finds that the appointment of the named person is in the best interest of the child.
Act of May 26, 1995, 74th Leg., R.S., ch. 751, § 47, 1995 Tex. Gen. Laws 3888, 3905-06, amended by Act of May 30, 1999, 76th Leg., R.S., ch. 1390, § 16, 1999 Tex. Gen. Laws 4696, 4700, amended by Act of May 22, 2001, 77th Leg., R.S., ch. 1289, § 5, 2001 Tex. Gen. Laws 3108, 3108-09 (current version at Tex. Fam.Code Ann. § 156.101 (Vernon 2002)). 1 Thus, at the time of the modification proceedings in this case, the statute required the party seeking modification to prove either that the circumstances of the child, the sole managing conservator, the possessory conservator, or other party affected by the original order have materially and substantially changed, and that appointment of a new managing conservator will be a positive improvement for the child or that a child ten years of age or older filed a writing naming the person the child chose as his managing conservator and appointment of the chosen person as the child’s managing conservator is in the best interest of the child. Id.
THE TRIAL COURT’S FINDINGS AND CONCLUSIONS
The trial court’s findings of fact and conclusions of law are silent concerning whether there had been a material and substantial change in circumstances as to the child or any party affected by the original order or whether modification of conservatorship would be a positive improvement for M.N.G. Instead, the trial *31 court found that there was “insufficient evidence to establish that [Father] (a) has, by act or omission, harmed the child in the past, (b) is in any way unfit as a custodial parent, or (c) poses an actual or potential threat of physical or emotional harm to the child as the custodial parent.” The trial court included a section in its findings of fact and conclusions of law entitled “State of the Law”:
This Court recognizes that the current version of § 156.101, Texas Family Code, does not include the previously-required proof that retention of the current managing conservator would be injurious to the welfare of the child; that is, the current statute no longer requires any showing of the custodial parent’s unfitness or danger to the child.
However, this Court is of the opinion, and finds, that the holding in, and the rationale of, Troxel v. Granville,530 U.S. 57 [,120 S.Ct. 2054 ,147 L.Ed.2d 49 ] (Sup.Ct. [sic] 2000), as applied in this ease, imposes the additional requirement of proof of actual or potential harm to the child or of parental unfitness. To consider the modification requested by the non-parent intervenor by any lesser standard would be an unconstitutional infringement on [father’s] right to make decisions concerning the care, custody, and control of his son.
The trial court then concluded, as a matter of law, that Grandmother had not presented “sufficient credible evidence” to demonstrate that father was unfit as a custodial parent or posed a threat to M.N.G.’s safety.
ISSUES
Grandmother contends the trial court committed errors of law by imposing requirements of proof of actual or potential harm or proof of parental unfitness in order for her to establish a right to modification of custody, rather than following the Texas modification statute, and in failing to follow
In re V.L.K,
STANDARDS OF REVIEW
A trial court’s order modifying conservatorship is reviewed under an abuse of discretion standard.
Gillespie v. Gillespie,
TROXEL
We first address the correctness of the trial court’s analysis of and reliance upon
Troxel
to impose a requirement that parental unfitness or actual or potential harm to the child be established as an essential element for modification of custody by Grandmother.
Troxel
arose from a visitation dispute between a mother and paternal grandparents. The mother sought to limit the grandparents’ visitation after the children’s father committed suicide.
The United States Supreme Court affirmed the Washington Supreme Court’s judgment.
Id.
at 63,
In
Troxel,
Justice O’Connor wrote that special weight must be given to a fit parent’s decisions regarding denial of visitation to the grandparents as third persons to protect the fundamental constitutional right of a parent to make decisions concerning the care, custody, and control of her children.
Id.
at 65-66, 70,
Father contends the trial court correctly concluded that the Texas modification statute is likewise unconstitutional in allowing modification of managing conservatorship by awarding custody to a nonparent based solely on the trial court’s subjective determinations of a material change in circumstances and positive improvement. According to Father, these requirements are too vague and broad to protect his constitutional due process rights as a fit parent to direct the care and custody of his child. We disagree.
Troxel involved a visitation statute, not a statute dealing with modification of custody. The purposes of a non-parentai visitation statute, as explained by Justice O’Connor, presume fitness of the custodial parent. As discussed below, the purposes of the Texas modification statute are entirely different from a visitation statute, and the modification statute does not presume fitness of the custodial parent. Additionally, contrary to the conclusion of the trial court, we do not read the decision of the plurality in Troxel as determining that the Due Process Clause requires a showing of harm or potential harm to the child. Troxel does not support the trial court’s placing of the burden on Grandmother to show unfitness of Father or harm or potential harm to the child as predicates for modification.
The modification statute’s requirement of a material and substantial change of circumstances is predicated upon the doctrine of
res judicata
as to the best interest of the child at the time of the original decree awarding conservatorship.
See Watts v. Watts,
Additionally, as with all suits regarding conservatorship of a child, Texas courts have consistently held that “‘[t]he best interest of the child shall always be the primary consideration of the court’ in a proceeding to change managing conservators.”
In re T.D.C.,
The Texas Family Code does not define or set out the relevant factors to be considered when determining whether a requested change in managing conservatorship is in the best interest of or a positive improvement for a child. However, in other contexts involving a best interest analysis, Texas courts have applied the
Holley
factors — a nonexhaustive list of considerations for determining a minor’s best interest.
Holley v. Adams,
Included in the
Holley
factors are the desires of the child; the emotional and physical needs of the child now and in the future; the emotional and physical danger to the child now and in the future; the parental abilities of the individuals seeking custody; the programs available to assist these individuals to promote the best interest of the child; the plans for the child by these individuals or by the agency seeking custody; the stability of the home or proposed placement; the acts or omissions of the parent which may indicate that the existing parent-child relationship is not a proper one; and any excuse for the acts or omissions of the parent.
Holley,
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In
Troxel,
in contrast, the United States Supreme Court observed that the Washington Supreme Court had declined to construe the nonparental visitation statute at issue narrowly to require consideration of any specific factors but, instead, had interpreted it literally and broadly as allowing the trial court to order visitation with any person based solely on what the trial court believed to be in the child’s best interest.
We agree with Grandmother that, absent a directive imposed by Troxel requiring specific prerequisites for modification of conservatorship, the trial court erred and, consequently, abused its discretion in placing the burden on Grandmother to establish unfitness of Father or actual or potential harm to the child rather than the elements required by the statute.
THE PARENTAL PRESUMPTION
Father also argues that he is constitutionally entitled to the parental presumption that the best interest of a child is served by awarding custody to a natural parent, codified in the Texas Family Code as follows:
[U]nless the court finds that appointment of the parent or parents would not be in the best interest of the child because the appointment would significantly impair the child’s physical health or emotional development, a parent shall be appointed sole managing conservator or both parents shall be appointed as joint managing conservators of the child.
Tex. Fam.Code Ann. § 153.131(a) (Vernon 2002).
Father points out that the parental presumption, applicable in the initial determination of custody upon divorce, is rebuttable by proof by a nonparent that appointment of the parent would significantly impair the child’s health or development, citing
Brook v. Brook,
The basis for the parental presumption is the “natural affection usually flowing between parent and child.”
V.L.K,
The Texas Supreme Court determined in
V.L.K
that, whatever effect the parental presumption may have in an original custody proceeding, it cannot control a suit to change custody because a modification statute addresses different policy concerns than a statute governing an award of original custody.
V.L.K,
In the modification context, the State has a compelling interest to protect the child’s need for stability and to prevent constant litigation in child custody cases.
V.L.K,
In this case, the trial court did not follow the statute’s requirement that there must be a material change in circumstances, gave no consideration to M.N.G.’s written choice of Grandmother as his managing conservator, and made no finding concerning whether modification of custody would be a positive improvement for M.N.G. Instead, the trial court improperly imposed a burden on Grandmother to establish unfitness of Father or harm or potential harm to M.N.G. in retaining Father as managing conservator to support her right to modification of custody, and then found that she failed to carry that burden as to either element. Those findings were inadequate because they did not address the controlling elements required to determine whether modification was appropriate under the statute, and will not support the judgment.
See In re Marriage of Edwards,
Furthermore, we may not imply the required findings, as the parties urge us to do: Grandmother contends that the evidence is legally and factually sufficient to support the judgment based on implied findings of a material change in circumstances and that appointment of her as M.N.G.’s new sole managing conservator would be a positive improvement for M.N.G., and Father contends that it is not. Where a trial court’s findings of fact and conclusions of law are based on an erroneous interpretation of the law, an appellate court may not imply fact findings to support the judgment.
Wilson v. O’Connor,
CONCLUSION
We hold that section 156.101 is not unconstitutional as applied to M.N.G.’s father. We further hold that the trial court *37 abused its discretion by not following the requirements for modification of conserva-torship of a child contained in family code section 156.101. Therefore, we sustain Grandmother’s issues. Accordingly, we reverse the trial court’s order denying modification and remand for a new trial.
Notes
. As amended, effective September 1, 2001, after the proceedings and final order in this case, the current version of section 156.101 eliminates the requirement of a showing of "positive improvement" and adds a third ground for modification: "the conservator who has the exclusive right to establish the primary residence of the child has voluntarily relinquished the primary care and possession of the child to another person for at least six months.” Tex. Fam.Code Ann. § 156.101(3) (Vernon 2002).
. Hereinafter, all references to Tex. Fam.Code Ann. § 156.101 in this opinion will refer to the version of the statute in effect at the time of the trial court’s ruling, unless indicated otherwise.
. In his brief, father also claims the modification statute is unconstitutional as applied to him because it allegedly violates the equal protection and privileges and immunities clauses, his right of association, and his due course of law rights. U.S. Const, amend. I, IX, XIV; Tex Const. Art. I, §§ 3, 19. Father did not raise any of these issues in the trial court. Generally, before a party may complain on appeal, the alleged error must be brought to the trial court’s attention; however, a party who obtains a favorable judgment has no reason to complain to the trial court and does not waive alternative grounds denying recovery when the judgment denies recovery on a ground that is later reversed.
See Oak Park Townhouses v. Brazosport Bank of Tex., N.A., 851
S.W.2d 189, 190 (Tex.1993). Nevertheless, the alternative grounds must have been raised in the trial court before they can be considered to support the judgment.
See id.; see also Worford v. Stamper,
. In their concurrences, Justices Souter and
*33
Thomas concluded that the statute was overly broad on its face and would not have addressed whether it was unconstitutional as applied.
Id.
at 75, 80,
. The version of the modification statute at issue did not expressly set forth the "best interest" requirement, but that omission was remedied in the 2001 amended version. Tex Fam.Code Ann. § 156.101 (Vernon 2002).
