in the mortal instruments are clary and jace related
List of The Mortal Instruments characters At last, Magnus wakes Clary's mother Jocelyn, who informs Clary that Jace is not her brother. In fact, Sebastian (the real Jonathan Morgenstern) is her brother. It is soon revealed that Sebastian is a spy for Valentine and that he tried to seduce Clary into teaming up with him. Clary then tries to locate Jace to help him. She runs into Valentine, who ties her down in order to complete his summoning of the Angel by using her blood. Then, when Jace arrives to rescue her, Valentine forces her to watch as he fatally stabs Jace in the chest. Upon summoning the angel, Clary changes the marks on Valentine's summoning circle, giving her the ability to control the Angel, and after Valentine is slain, she wishes to have Jace back. After Jace is brought back to life, the two get together, now that they know that their love for each other isn't incestuous.
City of Glass (Clare novel) The next day, Clary and Sebastian go to Ragnor Fell's house, where Clary is shocked to discover that Ragnor has been killed and that Magnus is there in his place. Magnus freezes Sebastian and informs Clary that she must gain a spellbook in the Wayland country home in order to save her mother. After unfreezing Sebastian, Clary and Sebastian leave and travel to the ruins of Fairchild manor, where she and Sebastian share a kiss that she breaks due to it not feeling right. She thinks about Jace throughout the whole kiss. Sebastian informs Clary that Simon is in jail.