Magnus And Alec

Your Mother had you sixteen years ago with Magnus Bane who was now married to Alec Lightwood. Your mother never told him until you got your magic not knowing how to deal with a supernatural child when she was a Mundane herself. She finally called him.

Your Mother: "Hello.......Magnus i wanted to let you know you have a child they are sixteen now they have magic i dropped them off somewhere i cant control them"