Honestly, I kind of hope the abusive brother got reincarnated too because 1. It gives the backstory more relevance than just flavoring and 2. I think it would be a good opportunity for Rose to overcome what was done to her. It's kind of framed that she died running away from him and this world is an escape from him, but we know from the history that he has an uncanny nack for following her wherever she goes. She needs to face him or someone like him head on if this is ever going to be resolved.
Honestly, I kind of hope the abusive brother got reincarnated too because 1. It gives the backstory more relevance than just flavoring and 2. I think it would be a good opportunity for Rose to overcome what was done to her. It's kind of framed that she died running away from him and this world is an escape from him, but we know from the history that he has an uncanny nack for following her wherever she goes. She needs to face him or someone like him head on if this is ever going to be resolved.