Hello,
So my FI and I decided not to invite cousin's children because it would be too expensive. We addressed the invitations appropriately, with only the names of the individuals invited on the physical invitation. I recieved an RSVP from FI's cousin and she RSVPed with all of her children. 3 of them. What's the best way I (or my FI) should go about informing her that her children were not invited?