I think I know the answer to this already- but I want validation, I guess. I am the MOB and rec'd email from MOG not to invite a guest on her own brother's invitation. I asked my daughter why and she thinks it's because MOG's brother is gay and MOG doesn't want him to bring someone. I would never consider doing such a thing and told my daughter that I will also invite a guest - despite the email. We are hosting the entire reception btw. My future son in law suggested that it might be that his mom has offered to pay airline costs for her brother and could not afford him to bring a guest. I think it would be understood that his guest would have to pay his own way if he wanted to attend. Any suggestions?