The questions that should follow now that the rest of the family is now available are "Who had the authority to grant this to him, do they have the authority to

The questions that should follow now that the rest of the family is now available are "Who had the authority to grant this to him, do they have the authority to revoke it, has the rest of the family spoken with this outside authority, and what else can be done?" There has to be some sort of provision for dealing with situations like this, because this is far from the worst possible outcome. (e.g. "Great, $social_worker, you've now granted power of attorney to the person who lives with dad because dad was the only person able to get him to remain in treatment and on his medications, but who hates the rest of the family.")