they should also factor in height and weight as well as ethnicity, Jews and Italians mature younger so they should have a 1 year penalty and Polish and Irish mature later so they should get a one year credit - this way, all the kids will be the same height and weight and athletic ability and all games will end in a tie.
a second option would be to have all the kids graduating in the same year play against each other as they do now, whatever is better for your kid. | 
