So FI and I have decided to only invite guests over the age of 18 to our wedding.
However, when FI gave me his list for addresses, he did not know that is is improper to split up families. There is a family on his list with an 18 yo daughter who lives at home. When we addressed the STD, we addressed it to Mr. and Mrs. X with Ms. X written below to indicate that the daughter is also invited (don't worry, we plan on sending the 18 yo daughter her own formal invite when the time comes).
Turns out, this family also has a 10 yo son that I had no idea about until FI brought it up tonight. So basically, we have very obviously excluded the 10 yo by not including him on the STD envelope. FI did not realize that this was a breach of etiquette and I do not blame him, I should have done a better job of explaining it to him while we were compiling our guest list.
I feel horrible now and am afraid that these people think we deliberately disregarded their son. I would like to send them a note and apologize for the misunderstanding on our end and let them know that their son is absolutely welcome. Would this be appropriate?
What do yall suggest as a solution? I am embarrassed for having demonstrated such poor etiquette and feel badly if any hurt feelings have resulted from this.