Birth room?

I want my husband in the room of course but I also want my mom in the room too. The problem is if my mother's in there then his mother will want to be in the room too and I don't want that. She is the the best women in the world but I realy don't want her to see me like that at all! How do I tell her that hurting her feelings? This is the only thing I've been dreading about my labor.