I reprimand him and get him to say sorry (which in his case is a gentle stroke on his sister's arm), which he does, but he finds the whole 'hitting and being told off thing' very amusing and he's hitting her liteerally every 5-10 minutes and it's driving me crazy. He knows he shouldn't, his sister complains loudly every time and I wonder if I should actually be ignoring it instead?
It's too frequent to deal with properly every time as I can't get anything done otherwise.
Grrrr