Honestly, you are going about this the wrong way. As they say, revenge is like drinking poison and hoping the other person to die.

Do not spend a single second thinking about your brother or mother. Simply focus on you. Get better. Invest in you.

Also, personally, I'd simply exclude the brother from your life. No convo, just live around him.

Also, horrible parenting. Finders keepers? Your brother will wind up in jail or killed.