I'm questioning my brother's choice to invite some of his wife's 'friends' for a surprise party for his wife
Are you part of organizing this surprise party?
Yes, I'm one of the co-organizers.
You should not disrespect your brother's choice. It is his party for his wife. It is his choice who he invites.
I don't understand why he allowed his wife's closest bimbo friends to come. I'm confused since I thought that they were going to spend the night out and so they were not invited.
Well since the party is for his wife, you should really trust his opinion on this matter. This party is for her so the entire focus should be on what she would enjoy.