I have a lovely 4yo boy. We have no developmental concerns and since starting school he’s settled in well. He has an almost 2yo brother (so 2.5yr gap) who he is overwhelmingly positive about in the abstract; ie talks lovingly about his brother, includes him in his make believe stories, invariably. He can also be very kind and paternal towards him. However…. He often seems to be hysterical and unkind to him. Running up to him, repeating his name through gritted teeth and grabbing his cheeks, for example. He seems almost overwhelmed and beside himself but the manifestation of behaviour is crowding and unkindness. We’ve told him off and removed him from the situation but also generally taken the view that he’d grow out of it. After a particularly challenging day today, where this mist of hysteria / unkind behaviour towards his brother seemed to last all day (it might typically just be for a short intense period), I’m wondering whether we are being too permissive. Any one event isn’t awful but he’ll regularly walk past his brother and give him an elbow, for example. It’s low level violence but it happens a lot. How would you respond to this?