What on earth should we do?
We're at our wits' end with it and it's actually very hard to pick apart the incidents as they all seem to roll into one.
I think DS (4) is the instigator in the main. But the offending behaviour is insipid - basically winding her up. It's hard to punish him for it as there's not real specifics. Getting into her face, an arm squeeze here or there, following her about, taking away toys.
She reacts by screaming and screeching. She also reacts by scratching - which is totally inappropriate too. But it's her way of defence.
Does anyone else have this problem? It's like dealing with a box of frogs.