If I were capable and desperate for work I'd go around all the restaurants and leave my details for kitchen porter/plongeur work (it was good enough for George Orwell and even if they haven't go work now if you leave details it save them the effort of advertising if a post becomes open) and I'd sign up with a temp agency.

All the emergency money posts I have taken doing this have ended up yielding great friendships and anecdote generating experiences and your efforts may rub off on your dad.

The great thing about those sort of jobs is that there is no need to climb the greasy pole (though you might have to clean it) of a career.

Seeing you doing it may inspire him to do the same, men tend to be competitive and it may turn into a race to see who can get employment first (so you might get the sofa free before a post becomes available to you).

If you get a job (even a dull one) you will have another thing to talk/moan about when you get home, you can contribute a bit more to the household funds, you'll have more financial independence so it's a win, win situation.