I worked with a youth baseball Org in the nineties. Similar(not quite that large) situation. People woulD make all their kids move to the outfield. Scream things like “hurry up, Vince has to pick up his kids.” Finally a guy asked me about his birth certificate. Told him it was legit. Then he asked me about a death certificate. Short story..checked death certs. Guy was playing his son under a similar named dead cousin. Kid had no idea he was nearly three years older than he thought. They popped up at another park as well.