It's a catholic tradition, as Chénier says. But as Draco said, they were a bit bungler. According to tradition, Melchor the white bearded wasn't even the oldest, but he wanted at all cost to be the first to give Jesus Child his gift, and so He punished him with an instant-white hair beard
Instead of a Christmas Tree we set some figurines of the Birth: St. Joseph, Mary, Jesus Child, the mule, the ox, an angel and plenty of shepherds bringing gifts.
