I'm sorry you're going through this. Just document, document, document and wait out the 30 days. These laws are probably in place because of bad landlords (imagine being a good tenant and having your landlord decide out of the blue that s/he didn't want to rent any more, or wanted to rent to a relative) and you're unfortunately caught in the middle.
Make sure you document everything, including any damage that he's done, and treat it like a legal case. And next time, even with a relative, have a signed lease that spells out responsibilities and consequences.
In the meantime, do everything you can to (nicely) help him find a new place to live. I bet the increased privacy and lack of restrictions and nagging will be great selling points.