First, I don't understand why the father left without his children when he left home seeing how unstable the mother is.
I could excuse the son because firstly he experienced a horrible childhood (the disappearance of his sister, his mother's depression and the breakup of his family unit then the forced estrangement and the loss of his place within his family, That's a lot for a kid).
But, he is clearly aware that his actions are odious and seeks to satisfy his feeling of inferiority by using his sister's feelings to make her suffer.
In this kind of story, a good psychologist would have been enough to avoid all these torments.
First, I don't understand why the father left without his children when he left home seeing how unstable the mother is.
I could excuse the son because firstly he experienced a horrible childhood (the disappearance of his sister, his mother's depression and the breakup of his family unit then the forced estrangement and the loss of his place within his family, That's a lot for a kid).
But, he is clearly aware that his actions are odious and seeks to satisfy his feeling of inferiority by using his sister's feelings to make her suffer.
In this kind of story, a good psychologist would have been enough to avoid all these torments.