Question: who is jace's dad in the mortal instruments
Answer: Jace 's legal name changes throughout the series , from Jace Wayland ( when his father is thought to be Michael Wayland ) , to Jonathan Morgenstern ( Valentine 's son ) , to Jace Lightwood for the family that has taken him in , to Jace Herondale ( when his true father is revealed to be Stephen Herondale ) .