My son practices for a team. The coach is one of the players dad. And there are 4 other dad coaches. They play 11 a side. So their kids get to play every game and dont get subbed. 2 of these boys are v good . Two are not but they get to play the whole game. We travel and hour to a match sometimes and my son will get 5 minutes on the field. And thats not great for his confidence and he is probably better than two of the boys who play the whole match. So five positions are taken by their kids. Are there any rules for this?