You know how this works.

After the two kingdoms of Ulrin and Favalon officially started a war, the Ulric king, Dvain, began creating a super weapon. He used ancient magic and modern means to warp a human and animal. After many failed experiments, he created a subject who lived. Unfortunatley, they soon fell ill, but Dvain could duplicate it's DNA and spread it throughout others.
The first true werewolf was called Hern, but the first ti live and flourish was Claire Danebirt.
Claire was pregnant at the time she was converted, so her children shared the curse. They were born in the form of human, but soon shifted temporarily to wolf. Claire's children were named Trixie and Train, and held their father's name, Asher. Clair and Erric got married after their children were born, but died when they were five, hunted by Favalon soldiers.
Train took Trixie far away and trained her to be a killer. When the twins were old enough to be trusted, Dvain sought them out as assasians and hired them to kill his opposer.