Family can be complicated. Way back when, one of my roommates was going for a masters in social work and I use to skim a lot of her books. I've always loved to read (at times it was the only way I could get info) and it was an interesting topic.
One common idea that many of the textbooks spoke about was that families have values and even goals, and each family member is normally assigned a role. So, in reality, all of them were bullies -- my brother was just given the role of acting out in that particular situation. I have had enough experience with each family member to be able to say that that idea the textbooks spoke about made sense in my particular family history. I just don't recall the name of that particular idea or theory.
I get along better with my friends also. I'm thankful that despite the role I was given in my birth family, I have been able to relate to people in a completely different way as an adult. As for my birth family I have very little to do with them these days. My mother has passed away, I call my father occassionally and exchange holiday/birthday cards with my brother and sister-in-law.
Given the personalities involved, for the most part I'm fine with that.
The only exception is that even though in many ways my dad was not a good dad I'd like to visit him more and be of more help to him, but that is not possible. I have had some serious financial punches that I haven't recovered from yet so that makes affording long distance travel not feasible. Of some of the decisions made for him I don't agree with -- but I decided not to make an issue about it. My sister and brother didn't develop their attitudes in a vacuum -- my parents were largely responsible for it. I don't by nature normally take a back seat -- but I have decided to go along with it in regard to my dad's care. Sometimes I feel guilty about it, but I sincerely believe that my dad would be extremely unhappy if I took a more assertive role even if it ended up with better decisions being made for him.
My situation is that most of my friends and acquaintences think that I'm very competent and a source of good ideas, and my birth family likes to think that I'm incompetent and defective in many ways including intelligence. To say that the difference in attitude between the two groups is huge would be an understatement.