Mike - if he's everything you describe, I would not see a problem with it. I love the idea of family living together, and in the long run could see it benefitting your father and your children tremendously. I.E., he could probably be more help to you and your wife then a hinderance - particularly if both of you have jobs. But you should talk and talk and TALK some more with Lisa about this to make sure you two are on the same page. And then talk about what future problems could come up with his health and both yours and her patience to deal with him as he gets older. Otherwise, I salute your decision. Good man!