Totally agree with what's been said here. I too was wondering why you feel a need to move and make this happen for your H. Is it because you'll need to find a place you can better afford? I was going to say that it might be better for D3 to stay where she's comfortable, but you're her Mom and you know what's best in your sitch. Is H planning on taking roommates in to the apt you're currently living in? If so, does he think D3 might feel as if he's rejecting you and her for others?
You've gotten some great advice and I don't have anything to ad. Just know that I'm thinking of you.