Key Plot points
What I remember is that he was under some sort of blood lust and went on a rampage in some city I can't recall and his brother is a vampire and his dad is something powerful which I also can't remember.
I do remember his dad had some sort of weird hard to pronounce name. He was greatly feared and on some sort of council and his vampire son's wife called him Ry.
I also remember the werewolf bit a librarian from that town who had a daughter and that's who he ended up with.
Chronology and other relevant info
I read it close to 10 years ago.