FI and I are having a small wedding and are not inviting children. The save-the-dates have gone out, and we addressed them properly to only those invited. FI was hoping his out-of-town sister would get the hint and understand etiquette, but she and her husband have begun making plans to attend with their two young children. (As a bit of background, FI is not close *at all* with this sister, and has never met her kids).
So... last night he told her sorry, but we cannot accommodate children at the wedding, etc. etc. and offered to help her find a babysitter in the area if she is still going to bring them. To try and smooth things over (especially since we've never met these children before), he mentioned that we were planning an informal gathering the night before the wedding, and that her children were welcome to attend that.
Was this rude? I know we're not supposed to invite uninvited wedding guests to pre-wedding festivities, but if she's going to bring her kids to town anyway, FI didn't want it to look like we don't want to see them at all.