[quote=@Host]
<Snipped quote by Mammalia>

Annoying him would be unwise. 
[/quote]

"Annoying" him is the only way left to do it. Eventually, there is nothing he can do to stop it. Even under total punishment, he would not be free from the plea each day. The only way to stop it would be to kick them out. One day, he would have to realise that his family is not happy. If nothing else works, this is a last resort.