Legal Question in Family Law in Arizona

Any parent can voluntarily surrender their parental rights and responsibilities. However, that person cannot "appoint" someone as their fill-in parent. However, you could file a motion for temporary guardianship and ultimately adoption at the same time that father is leaving the picture.

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Although a biological father can consent to someone adopting the child, you would not be able to apply to adopt your girlfriend's child until you had been married to her for a year. In other words, you can adopt as a step-parent (so that you and the mother would then be the child's legal parents).