That's a tough situation to be sure.
With two sons I can guarantee you that there were fights and hard feelings. I often got called in as mediator and judge. It was not a great place to be in.
I know how I would deal with it with my children but every child is different and no "solution" works for every scenario. Good luck.
Side note: If you want to receive curation / money for your posts they typically need to be longer. Usualy aim for 300-500 words with an image and original content (no AI) to increase your chances of getting rewards.
Some places are good for short posts (like LikeTu).
I see you tagged Hive Learners... They are typically 500 word minimum with HL certified (means they contacted you to verify you are a real person :)
RE: The First Bullying Often Starts at Home: When Your Sibling Rejects Who You Are