I'm really struggling with dealing with my two sons fighting eachother. They are 10 and 12. My older son constantly makes fun of his little brother. He belittles him calling him stupid, weak, dumb etc. When he does well on something he will put it down e.g. that's not even hard, I was doing that when I was younger than you etc. I have spoken to him about being mean to his brother however he still continues this behaviour. He has so much kindness, respect and patience with others but with his brother he is a bully.
My younger son is suspected of having Adhd which we are still waiting for a diagnosis for. However he completely loses control when provoked by his brother. So he lashes out and is violent as well as screaming his head off. I had to separate them today over a simple thing (who had the remote control) and I'm just concerned as they get bigger what damage they could do.
I feel like such a failure that my children behave this way. I'm a single parent and my kids do see their dad regularly. When I mentioned this to him he had the attitude of boys will be boys and acted as if it isn't a big deal. He framed the conversation with them that it was upsetting to me. However the issue if not that it is upsetting it is more that the behaviour is extremely toxic and abusive.
I have awful relationships with my siblings and really wanted better for my own kids but they have so much rage towards eachother. My elder son in particular really hates his younger brother and I just don't know how to deal with it.
Can anyone who has gone through this give me advice on how to deal with it.