The Rosewain family is an old Shadowhunter family.
In the 1980s, Eliza Rosewain attended the Shadowhunter Academy and became unpopular due to her unique views on Downworlders and the role of Shadowhunters in the mundane world. She later married into the Wayland family.
A branch of the Rosewain family in Cumbria became good friends with one of the oldest werewolf packs in Europe. The Rosewains have since maintained a long-running friendship with them. Due to the Cold Peace, however, the Rosewains tried not to draw too much attention to this relationship, for the protection of the pack rather than any feelings of shame.