Anybody remember the famous case of "Genie" the girl kept in a cage by her parents, strapped down to a toilet, who at age 5 or so only knew how to say "Don't!" and "Stop it!"
She was rescued, and they tried to rehabilitate her. She didn't get far learning language, as I recall and ended up in a state home.
THEN THE PARENTS SUED THE STATE. Oh, brother.
https://en.wikipedia.org/wiki/Genie_(feral_child)