Hey all

Fiancé has a remarkably trashy cousin with three completely out of control children whom she refuses to discipline. (ex: at church they have been known to lie down on the floor and kick the pews with no consequence, and at their grandma's funeral, they ran around and whined and one threw his toys into the aisle.)
Given their history of bad behavior, how can I go about telling her that I will be providing a babysitter for her kids during the ceremony? Other children in our families are well behaved and will be participating as flower girls and ring bearers.
I plan on only actually inviting her and not mentioning the kids, but I'm pretty sure she will bring them regardless.
Any advice on how I can avoid these little monsters while not causing major drama in the family? Thanks!!