your sibling hates you and you.......
.....don't find out until you are in your sixties. My sister is two years older than me and while growing up we fought all the time. It wasn't a happy household. My father never wanted children. I learned as an adult that he picked on her and she picked on me. We were total opposite personalities she the introvert got married right out of school to get out of the house. I moved out and started a life of my own. I moved to another state and we each had and raised a family, then one day I thought it would be nice if we could finally get close. Without any warning or explanation she told me to stay out of her life. It wasn't until then that I realized she had always resented me and we were NEVER sisterly. I got over it but it took a long time.