<P> For most of the books , Jace 's sarcastic , cold remarks and behavior hide his tortured and angry soul . In City of Ashes , his strong `` bad - boy '' personality makes Maryse Lightwood ( his adopted mother ) somewhat scared of him , worried that he is too much like Valentine , who was believed to be his real father until the assumption was proven false in City of Glass . Jace and Clary fall in love in City of Bones , making Clary the only girl Jace has developed real genuine feelings for , but after they find out they are `` siblings '' , each attempts to get over the other by dating other people . He is naturally overprotective and caring for her , although Clary does not see this due to her internal suffering . At the end of the third novel , City of Glass , Jocelyn contradicts Valentine 's avowal that Jace and Clary are siblings , telling Clary that Jace is actually the son of Celine and Stephen Herondale . The truth frees Jace and Clary from the torture of having seemingly incestuous feelings for each other , allowing them to accept their mutual feelings and become a `` real '' couple . </P>
<P> For most of the books , Jace 's sarcastic , cold remarks and behavior hide his tortured and angry soul . In City of Ashes , his strong `` bad - boy '' personality makes Maryse Lightwood ( his adopted mother ) somewhat scared of him , worried that he is too much like Valentine , who was believed to be his real father until the assumption was proven false in City of Glass . Jace and Clary fall in love in City of Bones , making Clary the only girl Jace has developed real genuine feelings for , but after they find out they are `` siblings '' , each attempts to get over the other by dating other people . He is naturally overprotective and caring for her , although Clary does not see this due to her internal suffering . At the end of the third novel , City of Glass , Jocelyn contradicts Valentine 's avowal that Jace and Clary are siblings , telling Clary that Jace is actually the son of Celine and Stephen Herondale . The truth frees Jace and Clary from the torture of having seemingly incestuous feelings for each other , allowing them to accept their mutual feelings and become a `` real '' couple . </P>
who does clary end up with in the mortal instruments series
who does clary end up with in the mortal instruments series
Jace
Jace