Background
Shiva said she had no children. She was lying. But you knew that -- you've met Cassandra Cain.
Jason Todd was born to Sandra Wu-san a year before Cass, in Gotham, and lived briefly with her before Sandra was contacted by David Cain, at which point Jason was abandoned to his father, Willis, and step-mother, Catherine.
He follows canon until ADitF, when he is reunited with his mother. She lies to him, because Lady Shiva doesn't want a child.
But there's a difference between 'not having an interest in a child' and 'letting the Joker kill your child'. She rescues her broken, beaten son before the bomb goes off, and Batman never sees him again.
Jason has been training with his mother for the past several years. Bruce still has no idea what happened to him.
Jason Todd was born to Sandra Wu-san a year before Cass, in Gotham, and lived briefly with her before Sandra was contacted by David Cain, at which point Jason was abandoned to his father, Willis, and step-mother, Catherine.
He follows canon until ADitF, when he is reunited with his mother. She lies to him, because Lady Shiva doesn't want a child.
But there's a difference between 'not having an interest in a child' and 'letting the Joker kill your child'. She rescues her broken, beaten son before the bomb goes off, and Batman never sees him again.
Jason has been training with his mother for the past several years. Bruce still has no idea what happened to him.