AshleyBenson484
Sarah Lightwood is the older sister of Isabells Lightwood and the younger sister to Alec. Her parabatai is Isabelle.
But when Valentine Morgenstern attacks the Institute, Sarah and the team think of strategies to take him down.
His son, Jonathan Morgenstern is alive and wants Clary to join his side.
I am so sorry if I go from season to season to season, it helps me get the idea.