The conversation between human and AI assistant.
From the Mortal Instruments series, what is the childhood of Jace and Jonathan?
Was there any significant event during their childhood that shaped their character?
One significant event was when Jace discovered that he was not actually Valentine's son, which caused him to struggle with his identity and sense of belonging. Jonathan, on the other hand, was believed to have died during one of Valentine's experiments and was later revealed to have become the villainous Sebastian Morgenstern.