Legal Question in Wills and Trusts in Arizona

I have never heard of equitable adoption as a legal concept, although there is the more general idea of equity when law does not make people whole. It is possible a court could treat your stepmom as your "putative" (implied) mother since she raised you and treated you as such for more than five decades. But it is also possible they will follow the letter of the law and say that since she never formally adopted you, your birth mom is your only legal mother.

Best of luck to you!