Need to take a step back and ask for other opinions here as it’s hitting a nerve and I’m perhaps feeling more emotional about it than is necessary.
What would you put in place to prevent bullying between siblings? Or consequences for the behaviour. I’m talking about calling a sibling fat until they are in tears or shouting and intimidating and generally trying to act like “the boss”. DC in question living 50/50 between two homes so potentially not always same rules/consequences.