Curbing cheating in a 5 year old.

My son is very competitive and rather smart when he wants to be. My husband and I joke that he will either be a millionaire or end up in prison depending on how these next 13 years go.He cheats at everything. Board games, sports, and everything in between. He is involved in tball and on the first day they made the kids swear to play fairly. My son informed the coach that he couldn't make that promise because he was going to cheat. The coach thanked him for his honesty and asked him why he would cheat. My son told him that cheating is more fun. He wouldn't budge. My son is still playing and I don't believe he has cheated yet but it's still early in the season.We have tried telling him that we won't play with him if he cheats but his brothers and friends play with him anyway. If they dont then he just does something else. The coach has said that cheating will be penalized but my son says he can't get in trouble if he doesn't get caught. We have tried making the winner clean up after the game but that hasn't curbed the behavior. It also isn't possible in games that don't require clean up. I call him out when he does it and my other kids do to but he continues to cheat.Do we just have to keep trying and wait for him to mature or are there steps we can take that we haven't already that could help? We live in Massachuttes and his name is Brady so we probably set him up for this. via /r/Parenting https://ift.tt/2q8EBsu