under an equitable estoppel theory. The district court in the present ease noted that Poncho’s agreement constituted “an express contract to support the child.” Concluding its case survey, the court stated, in part, that the doctrine of equitable adoption as recognized in New Mexico should not be limited to cases of decedents’ estates, but that, in the appropriate case, the doctrine may be used in domestic relations cases. The court determined that this case was an appropriate case. Further, the district court determined, based on what occurs in statutory adoptions, that if an adoptive father is obligated to support a child, it follows that the biological father should be relieved of that duty. {31} No New Mexico case has addressed whether the doctrine of equitable adoption can be a (<HOLDING>). Yet several cases have extended the
holding that it was error for the trial court to determine the issue of child support without a child support guidelines worksheet holding that where payments are made on past due support they must first be applied to  current child support installments due then to accrued and outstanding interest on  delinquent child support obligations and finally to the principal amount due on unpaid child support holding that the evidence did not support a finding that the parents intentionally abandoned their child holding that attorneys fees and costs may not be awarded as child support when they are incurred in a suit to modify the parentchild relationship that does not involve the enforcement of a child support obligation holding that parents may not voluntarily terminate their rights in a child to avoid child support payments or contract away a child support obligation