unadopt

Etymology

un- + adopt

verb

1. (transitive) To give up (someone or something previously adopted).
   Persons holding to a view that allows for one to be unadopted must confront another major theological hurdle. Why would God choose before the foundation of the world to adopt someone He knew He would eventually have to unadopt? 1990, Charles F. Stanley, Eternal Security, page 35
   She told us that she wanted to 'unadopt' Chandi. I explained to her that although our firm does not practice adoption law, I know that an adoption is like a live birth. It can't be undone, assuming the adoption was done properly. 2014, D. W. Duke, The Duke Legacy, page 268