Katherine
Brothers? Yeah, I guess that would make it more complicated. And a little creepy considering we No human blood relation between us, thankfully.
Does this vampire know you're here? Are you somewhere safe? If you need any help, this is the kind of thing I specialize in. Let me know how to find this guy and I'll do whatever I can to take him out for you. He might be strong, but so am I. He won't hurt you on my watch, okay?
Believe me, I know what it's like to do things you've regretted. If you can look at me without seeing the mistakes I've made -- and considering your history with the vampire you mentioned, I'm amazed you can -- I can do the same for you. As long as you're not a lawyer. (Only sort of joking. Another long story.)