Your grand mother has no knowledge of you being there or not. Funerals are for the living, to give those in mourning a chance to get together and lift each other up. That is NOT what you are getting, you are made to feel worse when there so what would be the point?

The funeral has nothing to do with your father and his stuff. It's between you and your Grandmother. Don't not go for those reasons. It's very helpful for people to say a final goodbye to someone they loved. You WILL regret it at some point of you don't go for the reasons you described.

You are not the immature one; your father is. You have nothing to feel guilty about.

Of course you should go. It's not about your insensitive dad and his girlfriend; It's about your grandmother. Focus on that.
This is about her and your love for her.

F*** Dad and his floozy.Attend the funeral to remember your grandmother.She was a bigger person and you will be too.You'll always have your memories of her.Attend to honor her as others have said.You'll thank yourself later.

so in short???????????????????????????? damn...........you just wrote a book.. look, you can go and say goodbye to her lifeless body... or go anywhere and cherish her spirit..

you must go you will regret it and carry the guilt for years. besides she would want you there its about showing respect.

I think you should go. Try to keep a low profile until it's over.🙂

Yes, go.