They wind each other up and end up hitting, slapping, scratching. It’s a few times a week and I’m so fed up. They seem to hate each other. The youngest (10) struggles with adhd and constantly wants to be near the older one (13). Eldest within seconds attacks her. Youngest sometimes fights back. What can I do??? Eldest is constantly saying that she has to hit her sister as I don’t do anything about it. But she literally throws the last punch. Tonight they both lost phones/iPads and went to bed early but eldest still thinks it’s unfair. Youngest is desperate for a reaction all the time.