I would take fero and sybelles advice and combine them, it would be exactly what i would have said. As you do live under his roof, you will need to deal with it until you can move out, which i hope for you, is not to far off. Seeing as how you have to do that, you could at least take what fero said and use it in the meantime, hopefully someone can help him deal with his issues somewhat, as fero said, those are his issues, not yours.

good luck to you.