Okay so I am having a fairly large formal wedding. My rehearsal dinner is not kid friendly in any way. Its going to be a cocktail hour and then a sit down dinner with toasts and all the works. My matron of honor, who is also my cousin has two small children, an 8 year old and 5 year old. The 8 year old is our flower girl/junior bridesmaid. Well, when i was talking to her about how the rehearsal dinner isn't for children because there is not going to be a kids menu or anything kid friendly. I suggested she bring her mother, her sister in law or someone to help with the kids, if not we can find a way to make it work. She immediately snapped at me saying "Dont worry we dont have to go to that we will just hang out at the hotel".My matron of honor and her husband are driving in from out of town. I feel guilty but it is just not a kid frieny thing. Her kids would be the only ones there. I feel like she may not understand how formal my rehearsal dinner is going to be. I do understand that it is difficult for people with children, especially coming in from out of town. My FMIL is the one who initiay said no kids and i do agree. What's the etiquette on this situation?