Nationally recognized parent expert, Amy McCready (2009) has made up a guideline to help parent’s attitude during and after games. She gives good tips on how you can handle your behavior and how to apologize for it. During the game she pushes you to be actively involved but sensitively so. For after the game let your child come to terms with losing if they did before you start to criticize what could or should have been done. You should also fess up to your actions if you showed poor behavior. Let them know it’s alright and encourage to show emotions. Being engaged during the game is an awesome act for your child to see but you must also remember that they are still children. You shouldn’t be seen verbally attacking the referees or the opposing team. Keep comments enlightening and motivating. You are the spectator, allow the coaches to coach. For most people, childhood is the time for developing into either a good sport or a sore loser.
“The messages that parents, teachers, and coaches deliver -- whether intentionally (via overzealous pep talks) or unintentionally (think lunatic antics from the sidelines) -- influence a child's feelings and behavior. "Kids are little sponges," says Elayne Savage, Ph.D., a family therapist in Berkeley, California, and the author of Don't Take It Personally! The Art of Dealing With Rejection. "They pick up the energy of how their parents handle competition and carry it into their adult lives." (RealSimple