I honestly don't think the family have any power over him. I think they were able to intervene during the time when he spiralled at Fashion Week, but then again with everything that has happened since, I don't know how true those details of being in hospital for that long are. Legally a person has to be in danger of themselves or of harming others before police or medical staff can intervene. Also, that process is quite lengthy and it only happens in rare cases where police are able to physically take someone to a facility to get treatment against their will. Our human rights come into play and they take that very seriously.
He has always behaved in a childish way, demanding, attention seeking and a bit of a know it all (without actually knowing much). He can also talk his way out of anything. He has hurt a lot of people in Geelong (myself included) and I would say he is trying desperately to win some people back (which I doubt will ever happen).