Help improving ball sharing in 2nd grade boys?

I’m coaching my son’s 2nd grade team because no other parents volunteered, so I’m doing it. I have No experience in basketball coaching. I’m having a problem with a couple kids that just ball hog, force bad shots, and if forced to pass will only pass to one other kid even if he’s double covered and other teammates are wide open—it’s the same story in games and in scrimmages. We’re 5 weeks in and I’ve run out of ideas. What works?