I don't have any good advice except to move in with your mother and find someone else to keep your cats. Is there a no kill shelter or rescue that could help or lead you in the right direction? Just finding someone that could temporarily keep your cats...I'm sorry that you're going through this...

edited: And, maybe I've missed something or am just stepping over a line by suggesting this...would David be able to keep the kitties temporarily? Again, I have no idea if y'all still communicate or anything...just a thought, though...