What to do when one DC takes their disappointment out on their siblings

[MorocconOil]

Both DSs age 7 and 9 are doing martial arts at school. Today DS1 age 9 discovered he had progressed one belt in the last test whilst some of his peers progressed two belts. When he came out of school he was fuming about this and punched DS2 in the stomach. DS2 only progressed one belt so it wasn't out of jealousy.

I told DS1 this was totally unacceptable and that while I understand he is disappointed, he should not take it out on his brother. I comforted DS2 and made DS1 apologise.

This is not the first time he has done this, and I am at a bit of a loss about how to deal with it. It makes me feel really angry, and I don't handle it very well. Has any one experienced this with their DC?

I would be fuming if one of my children did that.
and I would suggest that if doing martial arts is going to result in him being so angry and lashing out at people then perhaps until he can control himself he should stop doing it.

also a chat with him later, when you are both calm, about why this is wrong and some problem solving with him about different ways of dealing with his feelings would be appropriate.

Thanks for that Yesterday. You are right about problem solving later when DH gets home, and I am not on my own with 3 DC. It was very public as well which makes it worse. I was talking to another Mum when DS2 was hit, and my neighbour heard me telling DS1 off.