A Place to Be Loved 1993 on netflix

Gregory Kingsley, a boy passed off onto social services by his natural mother and abused by his natural father, finds the foster family he is put into to be the type of family he needs and takes his natural mother to court to have her parental rights revoked so that he can be adopted by the Russes. The story is based on the real case of the boy who really did have to take this action to avoid being sent back into an unacceptable situation.