My fiance has one brother who he is asking to be his best man and he's married. I think it would be a nice gesture to ask my fiance's sister in law to be a bridesmaid and it would give us the chance to get to know each other better since they live about 4 hours away and I've only talked to her a few times. However, I don't want to make her feel uncomfortable by asking her since we don't know each other very well and she won't know any of my other bridesmaids. Any suggestions on what I should do?