"Daco's dees," he calls them. I'm pretty sure that translates to "Jacob's these," implying they are his antlers, and no one else's.
He commandeered my sparkly reindeer antlers the moment they came out of Christmas storage. He wears them around the house all the time, usually as a visor with the antlers pointing straight out in front of him, but occasionally pushed back on his head, if I insist.
And only on very, very rare occasions does he share these antlers. But only with his little brother. And only long enough for me to snap a quick picture.