Hello. My DS (4yo) has some friends who are twins. For his birthday party (of course) we invited both but I used one invite. Is this horribly rude? We also invited some other 4yo and their younger siblings on the same invite, iyswim. I hope I've not been rude but would rather know so that I don't repeat the faux pas in future.
(BTW at their birthday party, of course we got each child a separate birthday card and present.)