In the Interest of S.C.S.

MAJORITY OPINION

YATES, Justice.

This is an appeal from the trial court’s cumulative judgment for child support ar-rearage entered in favor of Patricia Sprouse, the appellee and mother of S.C.S. and M.D.S., and against Jesse Richard Sprouse, the appellant and father of the children. In three points of error, appellant complains that (1) because section 157.005 of the Texas Family Code is a statute of limitation, the recent amendment extending indefinitely the period of enforcement for past due child support violates the Texas Constitution’s prohibition against ex post facto laws or, (2) alternatively, Patricia Sprouse’s action is barred either by laches or by a ten-year statute of limitation. We affirm the trial court’s judgment.

I. Background and Procedural History

Jesse and Patricia Sprouse were divorced for the first time in Jefferson County, Texas, in 1968.1 At the time, they had two children, S.C.S., born November 22, 1965, and M.D.S., born September 30, 1967. The court ordered Jesse to pay monthly child support for each child until the “youngest of such minor children shall have attained the age of eighteen years.... ” The amount of support was fixed by the order at $90.00 per month. *833Then, in March 1971, Jesse and Patricia remarried, separated later that year, and divorced for the second and final time in November 1973. The second divorce was finalized in Louisiana and was silent as to whether Jesse was obligated to pay child support. In 1975, Patricia sought and received a modification of the Louisiana divorce decree to include an obligation that Jesse pay child support. This order, entered as a consent judgment, required Jesse to pay $130.00 per month for the children’s support on the “30th day of each successive month thereafter.” In 1980, Patricia filed a motion to modify in a suit affecting the parent-child relationship (“SAPCR”) in Harris County, Texas. The SAPOR court entered a final order requiring that Jesse pay $250.00 per month in two equal installments.

Evidently Jesse never paid anything towards his children’s support,2 and in 1999, Patricia sought to reduce the amount in arrears to a cumulative money judgment. At the same time, she sought to have the arrears enforced through a withholding order. Then, on August 18, 1999, Patricia non-suited Jesse. On September 1, 1999, the new version of section 157.005 of the Family Code went into effect and on September 10, 1999, Patricia filed a second motion for cumulative money judgment. At the time the court below rendered judgment, the amount in arrears, including interest, stood at $94,666.14.

II. Section 157.005 of the Family Code

In his first two points of error, appellant contends that, because section 157.005 of the Family Code acts as a statute of limitation, he had a vested right to not pay child support arrearage prior to the time the 1999 legislative amendments went into effect; hence, the new version of section 157.005 constitutes a prohibited ex post facto law under the Texas Constitution. Alternatively, he argues that, if we conclude the new version of section 157.005 is not a statute of limitation, we should look to the residual statute of limitation found in the Civil Practice and Remedies Code. Tex. Civ. Prac. & Rem.Code Ann. §§ 31.006, 34.001 (Vernon 1998).

The current version of section 157.005(b) reads, in relevant part:

The court retains jurisdiction to confirm the total amount of child support arrearages and render judgment for past-due child support until the date all current support and medical support and child support arrearages, including interest and any applicable fees and costs, have been paid.

Tex. Fam.Code Ann. § 157.005(b) (Vernon 1999) (emphases added). Prior to this amendment, section 157.005 provided that “the court retains jurisdiction ... if a motion for enforcement ... is filed not later than the fourth anniversary after the date (1) the child becomes an adult....” Tex. Fam.Code Ann. § 157.005(b)(1) (Vernon 1995). Appellant argues, therefore, that his right to not pay the amount in arrears vested four years after his children turned eighteen, i.e., on November 22, 1987 and September 30,1989, respectively.

Section 157.005 and its predecessors, however, have been consistently interpreted by a majority of jurisdictions in this State as defining the contours of the court’s jurisdiction, not as a time frame within which a party must file a claim or forever lose the right to do so.3 See, e.g., *834In re Cannon, 993 S.W.2d 354, 356 n. 2 (Tex.App. — San Antonio 1999, no pet.) (holding “157.005 limits the trial court’s power to hear a case; it is not a statute of limitations”); In re Kuykendall, 957 S.W.2d 907, 911 (Tex.App. — Texarkana 1997, no pet.) (holding that the time limits are “not in the nature of a statute of limitations, but [are] instead a limitation on the power of the trial court to hear the case.”); In re M.J.Z., 874 S.W.2d 724, 726 (Tex.App. — Houston [1st Dist.] 1994, no writ) (holding that, unlike a statute of limitation, the four-year period does not run from the accrual of a cause of action, but from the time the court’s jurisdiction normally ends); In re C.L.C. & S.D.C., 760 S.W.2d 790, 792 (Tex.App. — Beaumont 1988, no writ) (holding that there is no tolling because the statute is jurisdictional); Sandford v. Sandford, 732 S.W.2d 449, 450 (Tex.App. — Dallas 1987, no writ) (finding trial court lost jurisdiction to cite husband for contempt on child support due more than ten years before wife filed motion).4 In view of this authority, we now hold that 157.005 is not a statute of limitation; rather, it addresses how long a court has jurisdiction to enforce its orders.5

*835Our holding is consistent with another intermediate appellate court’s interpretation of a similar statute defining a trial court’s contempt jurisdiction. Ex Parte Wilbanks, 722 S.W.2d 221 (Tex.App.— Amarillo 1986, orig. proceeding). The issue there was whether a new amendment rejuvenated a court’s contempt jurisdiction.6 Id. at 222. The court upheld the conviction against a challenge that the law was an ex post facto application because “laws which affect only a remedy, such as providing a limitation period, for enforcing substantive rights do not come within the scope of the constitutional provision against retroactive laws.” Id. at 224. This same reasoning applies here.7

Appellant argues that we should be persuaded by the Beaumont court’s decision in In re A.D., 8 S.W.3d 466 (Tex.App.— Beaumont 2000, pet. granted). In that case, the court held that an administrative writ of withholding for child support ar-rearage became time barred four years after the youngest child turned 18, and that issuing an administrative writ of garnishment to an already-barred claim violated article I, section 16 of the Texas Constitution. Id. at 467.8 As we have already explained, however, a majority of courts have held that section 157.005 is not a statute of limitation; rather, it limits a court’s jurisdiction to hear a case. Because it is a jurisdictional provision, it does not confer any vested right, unlike a statute of limitation. Compare Baker Hughes, Inc. v. Keco R & D, Inc., 12 S.W.3d 1, 4-5 (Tex.1999).

In the alternative, appellant argues that, if section 157.005 has no statute of limitation, then we should look to the so-called residual statute of limitation found in the Civil Practice and Remedies Code. In support of this argument, he relies on Huff v. Huff. 648 S.W.2d 286 (Tex.1983). In re Kuykendall explains why reliance on Huff is inappropriate in light of the statutory changes enacted since Huff was decided. 957 S.W.2d at 910. For example, in the same series of changes that removed the ten-year limitation for enforcement of “unpaid and owing” child support, the Legislature eliminated as a prerequisite to enforcement the language “and owing” from the statute. Id. Under the rule that existed when Huff was decided, missed child support payments older than ten years were no longer considered “owing.” Id, Accordingly, the court interpreted these changes “to reflect a legislative intent to permit a court to render the confirming *836judgment for all unpaid child support,” not just the last ten years’ worth. Id. (emphasis added). Finally, the court found that “the general ten-year dormancy statute then comes into play only when the arrear-ages are coalesced into a judgment confirming arrearages,” and held that “the ten-year dormancy period then begins to run upon the signing of [a] judgment confirming arrearages, and not from the due date of the individual payments.” Id. We agree.

Accepting appellant’s interpretation leads to one of two conclusions. One conclusion is that the Legislature performed a futile act when it stripped the requirement that enforcement actions be brought within ten years from the date of the original judgment. For instance, suppose a court orders a father to pay child support until the child’s eighteenth birthday, as the court did here. The father does so, but after ten years of making timely payments, he decides to stop. According to appellant’s argument, the original judgment would now be dormant. Thus, the mother, who prior to this time had no reason to “enforce” the child support order, would now be unable to do so. This cannot be the result the Legislature intended, particularly in view of the legislative trend favoring easier enforcement of child support obligations.9 Alternatively, it leads to the conclusion that the mother would have ten years from the time of the missed payment to file a motion to enforce. However, if this were true, then Texas would return to the rule the Legislature abolished following the supreme court’s decision in Huff — that missed child support payments were no longer “owing” if more than ten years old.10 We cannot accept this interpretation as this also “violates the fundamental tenet that the legislature is never presumed to do a useless act.” Russell v. Russell, 865 S.W.2d 929, 936 (Tex.1993) (Gonzalez, J., dissenting). Appellant’s first two points of error are overruled.

III. The Doctrine of Laches

In his final point of error, Jesse claims that Patricia’s claim is barred under the doctrine of laches. In order to prevail on a claim of laches, a party must show (1) there was an unreasonable delay by the other party in asserting a legal or equitable right, and (2) the party asserting lach-es made a good faith change in position to his detriment because of the delay. Cald*837well v. Barnes, 975 S.W.2d 535, 538 (Tex.1998). The burden of proving these elements is on the one asserting the defense. Jamail v. Stoneledge Condo. Owners Ass’n, 970 S.W.2d 673, 676 (Tex.App.— Austin 1998, no pet.). Because Jesse presented the trial court with no evidence in support of his assertion that Patricia’s claim is barred by laches, he has waived this point of error. See, e.g., Castillo v. Neely’s TBA Dealer Supply, Inc., 776 S.W.2d 290, 292-94 (Tex.App. — Houston [1st Dist.] 1989, writ denied) (holding affirmative defense of ERISA preemption was waived by a defendant who did not plead the defense and offered no evidence in support thereof). Accordingly, appellant’s final point of error is overruled.

Affirmed.

. The facts, unchallenged by either party, are taken from the lower court’s findings of facts.

. We are not unmindful of the fact that there was, apparently, a period of approximately eight months in 1973, after Jesse and Patricia were re-married but before they separated again, during which the children lived with their father.

. We are aware of language in our opinion in Attorney General v. Litten which suggests dif*834ferently. 999 S.W.2d 74 (Tex.App. — Houston [14th Dist.] 1999, no pet). However, that case presented the issue whether the trial court erred in dismissing an action to register and enforce the support order of another state pursuant to a choice of law provision of the Uniform Interstate Family Support Act (“UIF-SA”). Id. at 77 (citing Tex. Fam.Code Ann. § 159.604(b) (Vernon 1996)). In apparently mixed language, we held that, "[i]n accordance with the clear language in Section 159.604(b), the 10-year Missouri, statute of limitation applies here instead of the four year limitation period provided by Section 157.005(b). Therefore, it was error for the trial court to dismiss this cause based on lack of jurisdiction under Chapter 157.” Id. (emphases added). However, that language is merely dicta, because earlier in the opinion, after finding subchapter G of section 159 set forth the procedures for the registration and enforcement of a UIFSA order, we held there was no statutory basis for applying Chapter 157 to a UIFSA action. Id.

. See also Du Pre v. Du Pre, 271 S.W.2d 829, 831 (Tex.Civ.App. — Dallas 1954, no writ) (rejecting retroactive law argument because amendment to Family Code "imposed no new legal liability on the father, but merely provided a more effective remedy or means of enforcing the existing legal liability.”); accord Harrison v. Cox, 524 S.W.2d 387, 391-92 (Tex.Civ.App. — Fort Worth 1975, writ ref’d n.r.e.) (holding laws affecting only a remedy are not within scope of constitutional prohibition against retroactive law, thus enforcement of child support arrearage does not impair any vested rights the father may have had); see also Ex parte Wilbanks, 722 S.W.2d 221, 223-24 (Tex.App. — Amarillo 1986, orig. proceeding) (holding new Family Code section was purely remedial statute governing the time of enforcing the existing legal liability for child support by contempt, thus not an ex post facto law).

. In In re Digges, the San Antonio Court of Appeals noted that "the [1997] amendments [to section 158.102] allow the income withholding remedy for collecting current and past due support to continue indefinitely but do not affect the four year limitations period on obtaining an arrearage judgment.” 981 S.W.2d 445, 446 n. 1 (Tex.App. — San Antonio 1998, no pet.) (citing John J. Sampson & Harry L. Tindall, Texas Family Code Annotated 481 (1998)). Sampson and Tindall's 2000 comment to section 158.102 reads, “[w]ith the elimination of that limitation [on the court’s jurisdiction], both the judgment remedy and the income withholding remedy for collecting current and past due support, plus interest, continue indefinitely.” John J. Sampson & Harry L. Tindall, Texas Family Code Annotated 570 (2000).

And their comment to the current version of section 157.005 reads, "[i]n conforming state law to federal law, the legislature has essentially eliminated the limitation period for confirmation of arrearages. An action for confirmation and judgment may be brought for as long as support payments, interest, fees and costs are unpaid. The 1999 amendment makes the money-judgment remedy established in this section consistent with the income withholding remedy found in *835§ 158.102.” Id. at 541. In other words, the law now treats deadbeat parents evenly, without regard to whether he or she is employed (income withholding) or not (money-judgment).

.The Wilbanks’s son turned 18 in July 1985. Effective September of that year, the Legislature extended a trial court’s contempt jurisdiction "if a motion for contempt for failure to comply with a court’s child support order [was] filed within six months after ... the child becomes an adult.” Id. at 223 (citing Tex Fam.Code Ann. § 14.40(b)(1) (Vernon 1986)). Under the statutory provision that existed when their son turned 18, the court’s contempt jurisdiction expired when the child became an adult, not six months afterwards. Id.

. See also Moore v. State, 677 S.W.2d 550, 553 (Tex.App. — Amarillo 1983, pet. ref'd), cert. denied 469 U.S. 856, 105 S.Ct. 182, 83 L.Ed.2d 116 (1984) (holding that creation of criminal jurisdiction in intermediate appellate courts did not work as an ex post facto law against defendant who filed appeal with high court three days prior to change in law).

. Indeed, if appellant's argument is correct, then In re A.D. overruled sub silentio In re C.L.C. & S.D.C., a decision from that court holding there is no tolling because the statute is jurisdictional, leading to a result inconsistent with the majority of Texas courts of appeals which have decided this issue.

. See, e.g., Sandford, 732 S.W.2d at 450 (discussing the early evolution of child support enforcement legislation). The dissent suggests that, because we "seemingly approve” of Sandford, our result should be different here. But the dissent misconstrues Sandford. In that case, the statute considered by the court — 14.41(b)—contained a restriction on the court’s jurisdiction: if a party failed to bring a claim for past-due child support, and the missed payment was more than ten years owing, then the court had no power to render a judgment for that payment. Id. at 450. Nevertheless, Sandford held that, if this forerunner to section 157.005(a) were a statute of limitation, the husband would have waived the argument by failing to plead it in the trial court. Instead, it found that 14.41(b)'s "wording, atypical of statutes of limitation, restricts the power of the court to enter judgment....” Id. at 450-51 (emphasis added). Accordingly, the court affirmed the judgment of the trial court to include only those missed payments that were more than ten years owing. Id. at 451.

. Even Sandford recognizes that, with the legislative changes to the Family Code, Huff is no longer controlling authority. Id. at 450.

It is true that before this change in the law, actions to reduce unpaid child support to judgment were ... subject to what [is now section 31.006 of the Texas Civil Practice and Remedies Code, but n]ow, however, such actions are ... subject to ... section 14.41(b).

Id. (citing Huff, 648 S.W.2d 286 (Tex.1983)).