I had a lot of resentment for the older bio-sib because of the way I was treated and always being compared but I never mistreated or disrespected this person in any way. I was always thoughtful and considerate because I wanted that sibling relationship, someone I could talk to, share my secrets with, all those things you should be able to do with your older sib. I looked up to this person and always felt belittled or like I didn’t matter. But after reading a comment from a friend (b4thirty8) (hope you don’t mind the shout out) they made me think that, it was a power thing. Like the older one was so controlled by the parents it created a quiet, shy, etc… person, because they couldn’t talk back, they couldn’t voice their opinions, they didn’t have that courage to do so, at least not in their household and when the parents weren’t around, that’s when the older one had the power to be mean and deceitful, especially to me. Probably because I was the new comer and the parents were giving me all the older ones hand me downs and it made the older one resent me. I understand to a certain point, that’s fine, but to continue to do it even years later, we should be past that by now.