i wouldn't have known what to do then either, don't feel bad. I am guessing the mother was raised the same way and that's why grandma said/did nothing. I am in NO WAY explaining or even on the side of the mother, but just to play devil's advocate. Lets say Mom was tired too. Maybe he wasn't an angel in the store. What I like to think I would have done is gone up to her and said something like, "I know raising children is hard, but I'm sure he's tired too. I'll pray for you that God gives you the patience and understanding you need in times like this." I would be sincere and try to say it in a kind voice. Of course she may be grateful and realize what she did, or she may curse you out and tell you to mind your own business. However she would react, I'm sure it would give her something to think about. I'm sure calling 911 would be the best way. But I'm not sure I'd have guts to do it unless I saw someone really beating their child. I guess it depends on the situation.

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I have OCCD
Obsessive-Compulsive Coupon Disorder!!!