This is all so exciting!
I'm very glad your father and Mr.A hit it off. It's good that they get along, even if there is no plan on coming out, at the very least they won't be objecting to your "friend" living with you if they like him.
It sounds like you had an awesome day, which is heartwarming. I always love hearing about things like that with "extended family" (I mean Mr. A). It's good to know that you can have family times even without coming all the way out, it gives hope.
About the move, I can imagine a lot of things will change and need to adapt, and there will be ups and downs, but I'm very excited for you guys and I can't wait to hear more about it.