I asked my fiance's daughter to be one of my BMs. We get along really well and she seems excited to be involved in the wedding. I'm actually closer to her age than to my fiance's. She's 21 and in college. I'm assuming she knows what bachelorette parties usually entail, but I'm not sure that I will feel comfortable drinking a lot and doing crazy, silly bachelorette things with my future husband's daughter. I also don't want to make this a PG rated party just because she might be weirded out. Any thoughts?