Activity for Tina

She and my Future Brother in Law have been dating about as long as my FH and I have. We aren't that close but she will be attending everything. Does she have to be in my wedding party or can I just invite her to everything?

My fiancé's brother (who is the best man) has been dating his girlfriend for about 3 years. I really don't get along with her and would rather spend time getting to know my fiancés brother better. Am I obligated to invite her to my wedding? Would it...