<P> He is portrayed by Will Tudor in the television series . </P> <Dl> <Dt> Family </Dt> </Dl> <P> Jonathan is the birth child of Jocelyn Morgenstern (née Fairchild) and Valentine Morgenstern . He was experimented on by Valentine while Jocelyn was pregnant with him . When he was born, Jocelyn knew that something was wrong with the child and had to try very hard to be around him . He is Clary's brother, and has an unusual sexual attraction to her, freely kissing her in City of Glass and almost forcing himself on her in City of Lost Souls with Clary having to fight him off, repulsed by his actions . The Demoness Lilith also claims that Jonathan is her "son" due to the fact that it is her demon blood that flows through his veins . </P> <Dl> <Dt> Love interests </Dt> </Dl>

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