Nope he will just have to live with it.

I don't think he'll have a hard time accepting it. He already knows about your brother after all. If he does get upset, then assure him that you're still the same person that he knew and loves, and that nothing has changed.

Sounds like your dad will either have to accept it, or he'll have a mid-life crisis and take off into the blue. Then you guys can have the house.

I can see the situation here, considering he's obviously dealing with one being that way. Having said that, you are what you are and i'm sure he will accept it.

I would just tell him and hope for the best.

It's hard for parents to understand. You and brother need to be patient with your father, because he grew up in a different time than you. You definitely need to tell him, but be gentle about it. When I came out my Mom cried. She said it wasn't because she was upset that I was gay, but because as a parent you build up all of these dreams for your child to do the same things that they did. When you come out, that kind of changes everything. Your Dad may not get it now, but in time he'll accept and he will never stop loving you.