https://www.theguardian.com/society/2020/apr/14/uk-cinderella-domestic-abuse-female-family-members

Edit: They call it 'Cinderella abuse' violence from step parents or step siblings to another is the stereotype, is worse then full sibling violence. But that's not actually what the study found. That level of abuse is reported 4 times as much now, but it's still much smaller than normal female sibling violence.

Shock horror women can be violent. I thought they found that women on average as just as aggressive as boys if you count in relationship and verbal aggression?

They don't even mention that.

I guarantee there's a lot more female violence that would count as abusive than they think then even in this study.