I am one of 7 children, #3 to be exact.
My parents did not teach us to get along and they certainly did not role model any admirable behavior. They were physically and emotionally and verbally abusive of each other and of us children.
The simple answer, is no, we do not get along.
I have a very close relationship with my youngest sister, whom I raised. I also raised my youngest brother, by unfortunately, my brother has picked up far too many of the worst elements of both of my parents.
My relationship with my sister is more of a mother/daughter relationship. She has turned to me for everything that a daughter would turn to a mother for. It was overwhelming at certain times of my own life, especially when I knew I lacked the maturity and experience to really help or offer insightful advice. Although, she still thinks I know everything.
With my own two children still at home children, I have invested an enormous amount of time teaching them to respect each others 'No' and basic negotiation skills in how to resolve conflict and how to get a long, etc. People often go out of their way to compliment me on how well behaved my kids are in public, and how admirable it how truly genuine their friendship is.
Basically, I have made a conscious effort to treat my children equitably in all areas, especially since I grew with the old-fashioned mindset that boys could do anything, and get away with anything. And we girls were virtually indentured servants.
I hope this helps!