We didn’t have Twin Days until high school, and it was still semi-tragic for me. Not because I didn’t have a twin, but because I wound up an unintentional and ersatz triplet.
Ever since kindergarten I’d been kinda-sorta friends with a gal, Melanie, who had the same last name as I did. (Consequently, people constantly asked if we were sisters, and finally we started lying and saying “Yes”. Unfortunately, decades later (in my mid-20s) I ran into someone with whom I’d gone to elementary school, and she mentioned having seen Melanie recently. I replied glibly that I hadn’t seen or heard from her since high school, and asked how she was, to which the girl leveled a semi-disgusted look at me and asked incredulously, “Isn’t she your sister?”)
So on the day before Twin Day, I suggested to Melanie that we should be “Twins” the next day. She replied that she’d be wearing black jeans and a red sweatshirt (hey, it was the mid-80s). Wow, she really plans ahead, I thought . . . in retrospect, of course, I can’t believe I didn’t catch on sooner.
Twin Day comes, and there I am in my red henley (it was as close as I could get) and semi-faded black Gloria Vanderbilt jeans with black ankle boots. And in walk Melanie and her best friend Debbie, in brand new identical black Levi’s, identical red sweatshirts, huge matching red bows in their hair, and matching black Chuck Taylor hi-tops. (see previous parenthetical comment about the 80s).
So there I was, looking all Single White Female (only Black, and . . . well, a few years before anyone would actually coin that reference) and desperate to be in the club.
It still hurts. :o
As for the OP, I’m curious - what would happen if your son and his two friends dressed as triplets? I mean, what are they gonna do, send a note home? (Surely they wouldn’t send the kid home . . . right?) I suppose that could get the other two kids in hot water, but since your son would have your permission to flout the rules . . .
As an alternative, I vote for including a fourth child.