I have a sister who is 29, she has her own apartment and her own life. I will never forgive her for abandoning the household in the short notice way she did 2 years ago, we were starving at one point because we no longer had her income to help pay the bills. I also think part of me was jealous she we free from the burden of having to provide for a mother who is too disabled to have a real job, but not disabled enough to get a free ride from the government. But time heals all wounds, so we get along okay. If you were to ask her who is her favorite sibling, it would be me.
My younger sister is 25. We share a room and have the same job at different pharmacies, so we share war stories about stupid fucking people every day. She's a bit snobby, and self righteous. She mainly only ever cares about herself, but I guess that's just how some girls are. Growing up, she had an easy time in school because I'd always be there to look out for her, but now that she's out in life and work on her own, she's made some enemies.

But she's my baby sister and I love her. If you were to ask her who is her favorite sibling, it would be me.
My younger brother is 18. Everyone loves him. He's such a fucking shameless clown, it's hard not to. Strangers wave at him from their cars or give him compliments on his hair, beard, or whatever Led Zeppelin or Boston shirt he happens to be wearing- EVERYDAY. Ever since he was a little child, he had a natural talent for drawing, but now that he's older we play guitar and piano together all the time, and deep down I'm so jealous at how good he is at EVERYTHING he does. He is the Angus to my Malcolm Young. If you were to ask him who is his favorite sibling, it would be me.