I think a lot of it is nature - not nurture. My sibling is the people pleaser, apologizing, thinks of himself as highly sensitive etc. If someone wanted empathy -totally he is the one to choose - not me.
I would have guessed therapy was right up his alley -but he hated it as much as I did. Actually, if he didn't look like me and my parents and if I didn't remember being taken to the hospital to see him after he had been born - I would think they brought the wrong baby home because his personality is so completely different than mine.

If I had issues with my parents - I would hope therapy could help with letting it go and moving on. But that doesn't seem to the effect it has.