Hitting, How do I approach this problem?

My two year old son is quiet the handful as most toddlers are, but yesterday when he was playing around and screaming, and you know how toddlers are when playing, they sometimes fight.. well my friends three year old daughter was pushed by my son and the 10 year old brother intervened and slapped my son on the back, and pushed him away.. kind of made me a little upset but I didn’t say or do anything except asked my son if he was being nice and to say sorry, then we left.. but I need to talk to the mom to make sure it doesn’t happen again if they want to play date again.. she wasn’t there when it happened, she was cooking.. so I didn’t tell her what happened.. is it offensive to supervise my son when we go there and to not leave him alone with the older kid anymore? Or just stay away til she talks to him?

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