I'm going to cut off communication with my stepbrother
Why would you cut off your stepbrother?
he did something bad to me. His mother did something bad to me. And I did something bad to him too!
It's fine to distance yourself from toxic family members sometimes. Otherwise they may just keep taking advantage of you.
No don't do that. We will just work out our issues.
Well I'm glad you're going to at least try to talk to them and work it out!