Dear Abby >> My son is a loving husband, father and son. He coaches his 12-year-old son, my grandson, in various sports and sometimes is just a spectator. I’m worried because he often berates his son’s playing ability. He has yelled at him during and after games, whether he is coaching or not. He yelled and screamed at him in front of everyone and later at home.

I have told my son, to no avail, that it’s OK to give constructive criticism but without the yelling. I also have told him how it crushes my grandson each time he does this. My daughter-in-law is also at a loss for how to change his behavior. My husband coached my son in sports when he was young and he was hard on him, too. I love my family dearly, but I don’t know what to do in this situation. Abby, what do you think we should do?

— ‘Heartaching’ Grandma in New Jersey

Dear Grandma >> Your son may be a loving husband, but he could use some coaching as a father. Someone should point out to him that when a parent bullies a child about his poor athletic performance, it rarely produces a positive result. It makes him lose interest in the sport and damages the youth’s self-esteem, and the effects can sometimes last a lifetime.

After your grandson has had enough of the verbal abuse, don’t be shocked if he drops out of the sport. Your son should have learned from the terrible example his own father set that this kind of “coaching” usually doesn’t produce the desired result. He should take out his aggression elsewhere.

Contact Dear Abby at www.DearAbby.com or P.O. Box 69440, Los Angeles, CA 90069.