When putting together my guest list, my mother sent me a spreadsheet that my grandmother keeps that has all of her side’s names and addresses on them. I used this spreadsheet when addressing my wedding invitations. Apparently my grandmother doesn’t update the spreadsheet very often, because I just found out that the address list contained my uncle’s ex wife’s name instead of his current wife. I’ve never met the ex wife, and have only met his current wife once or twice. I feel so awful. I should have realized that the name was wrong when I hand wrote the invitations, but I didn’t. The current wife is understandably upset. My mom has reached out to her to apologize and offer to send them another invitation. This was not done maliciously, and I’m not sure what I can do to convey how embarrassed and sorry I am to the current wife. Should I write a letter to apologize? I feel so awful!