I love my mother-in-law dearly, but she is overstepping right now with many aspects of our July 2021 wedding--mainly the guest list. We really want to keep the wedding small-ish because we are paying for 2/3 of the cost, but she is paying for the other 1/3. We compromised to invite some of her friends (a couple of whom we've not met), but she is still pushing to add more people to the list. I have a large family and I am not inviting many of them (some are dance only). This is just eating at me. I don't want to ruin our relationship, but we really don't want to add any more people to the guest list. Anyone have suggestions for politely putting my foot down?