My son needs to lose weight?

Okay, so first of all, you should restrict his amount watching television and everything, and make him go outside. Also, you should not let him eat all of the junk food, if he is sneaking it, then stop buying it. You should give him a normal serving, and not let him have more, because that should be enough. Additionally, sit down with him and tell him the effects of being overweight and the consequences. Also, you should make him do more exercise. Running, sit ups, and sports are really good. Try entering him in a lot of sports so he can try new ones and maybe some that he likes. I hope I helped you and remember that you are not a bad parent.