Your best bet is to file a Petition for Custody by a non-parent in the Arizona Superior Court, Family Division. Since you have cared for her for 2 years, you have acted like her parent, and therefore can show that you stand "in loco parentis" to her parents. In order for you to get full legal and physical custody, you will need to show that her parents are unfit to care for the child. There is a presumption that the child is best parented by her biological parents, therefore you will need to show that they cannot care for their daughter. With the custody papers you can also ask that the parents be require to pay child support to you.
*The answer presented is for informational purposes only and does not create and attorney-client relationship between the question presenter and Laura B. Monte, Esq. or Donaldson Stewart, P.C.*
*Laura B. Monte, Esq. is licensed to practice only in the State of Arizona. Any answers presented are based solely on Arizona state law and case law.*
Answered on Aug 21st, 2012 at 12:39 PM