Me and my fiance decided to have "no children" at our wedding except for our 3 year old daughter and our two nieces who are the two flower girls (my brother and his sister dont believe in baby sitters). No, we have nothing against children, but we did decide on this due to keeping the wedding within our budget (yes our families have ALOT of kids) and we wanted our wedding to be more of a formal and romantic adult only evening event. So here is my problem, my brother's daughter is a very well behaved girl so I am not worried about her, however my fiance's sister's daughter is a not so well behaved 3 year old. We recently saw her biting and attempting to claw peoples eyes out (no exaggeration). She is a major tantrum thrower including screaming and kicking and well you get the point. Now in my family behavior like that is not acceptable and would be quickly punished, but my fiances family is very passive and pretty much lets her be wild without any consequence or attempt to control her. So I am so afraid that she is going to throw a fit or do something crazy right smack in the middle of a special moment in my ceremony and ruin the moment. I know it sounds a bit mean for me to worry about this, but I've been dreaming of this moment forever and I really don't want it to get ruined by something like this. Would it be rude for my fiance to talk to his sister about our concern before hand? Has anyone gone through this?