A: Whoever is closer to those people—you or your fiancé—should call and explain that unfortunately, you aren't able to include children. If you have a feeling that the kids will be dragged along anyway, make a seating plan that puts the couple at a corner table that can accommodate extra last-minute guests; if the whole family shows up, your mom or maid of honor should tell the maitre d' (caterers generally have extra meals on hand, so that shouldn't be a big problem). The more prepared you are for all scenarios, the more relaxed you'll be.
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