Adoption My half sister who is 48 wants my parents to adopt her she has been…

Adoption
My half sister who is 48 wants my parents to adopt her she has been known to take power of attorney of other relatives. She says she just wants Indian medical benefits. I was wondering can she legally get medical if she is not a direct desendant of my dad(not her ligit father) and also I was wondering if she is adopted and becomes a equal child what kinda powers can she obtain in my fathers estate.