Its canon that Arly did at least have Vin before her college years, so here's a young kirin and his baby sister playing with the babysitter, Tabi. Though Tsukasa was there earlier, she seems to have gone MIA on Tabi.
I've been wanting to draw the kids as kids for a bit... quite possibly longer than I can remember, so tada, done. And I find Vin being the easily miffed type when he was young to be adorable, to become a strong silent type in his later years.
Wonder what they're playing..