I don't like to talk about your father. Every time you bring him up, I join in and then you accuse me of bashing your dad. I'm not going to be tricked into it this time.
That's fine. It isn't really about him anyway. It's more about his girlfriend.
Why would you have a problem with her? She's been good to you and your brother. She's the more responsible adult in that house anyway. She has the job, pays the bills. She's great as far as I can tell
She's having a hard time picking out a theme for their wedding.