@GracieGirl,
I'm a little cynical about group and foster homes, myself, though there are probably some good ones.
Not to make anyone nervous, but despite father's express wishes, it is likely that that aunt will still have to go through the guardianship process. Should be a shoo in, but I'm sure the court will have to approve the process. I'm also pretty sure that with your dad being a lawyer, he's covered as many bases as possible.