I'm not suggesting keeping quiet Daffy. I'm suggesting playing a game and toying with the parachutist. There's a lot of fun to be had, especially if other members of the family are drawn into the 'game'.
Many families have these divas who appear and disappear, delivering their own form of goodwill. The best goodwill they can offer is a confirmed departure date, meanwhile having fun with their hyperbole and advice can be quite satisfying in a mischevious way!