I’m too different from my 4 sibs. First off, I’m the only one of the 5 of us who dared to leave our hometown, thanks to being in, then working for the Navy. I’m the only one with a scientific education and mechanical abilities, the only one who learned to sew, the only one who learned a musical instrument, the only one who spent any real time overseas… To this day, I’m the one who lives the farthest from all of them - not due to animosity, but because my husband and I really like where we are.
The sister who’s closest in age would never have been a friend - we’re just too different. We shared a room for 18 years, and that was quite enough.
My brother is a bit of a snob - not that he snubs people, but image is a big deal with him, the labels on his stuff are important, plus he plays golf and I can’t imagine anything more boring. 
The next sister is 7 years younger than I and she’s really weird about going places and doing things. She pretty much told her husband not to take a promotion that would have required them to move out of state because she didn’t want to move. Screw his career, she wanted to stay put.
The youngest sister, 11 years my junior, is the most outgoing and the most blatantly caring, but as far as I’m concerned, she drinks way too much and gets way too loud and doesn’t think nearly enough about tomorrow. I’m glad she enjoys life, but being around her more than a couple of hours is exhausting. We do better as FB friends.
I’d do anything I could to help any of them out, but if we weren’t related, we wouldn’t hang together.
I wouldn’t be friends with my husband’s sibs either. His one brother has an overly developed sense of entitlement and an excessively right-wing point of view about everything. His other brother has mental and emotional problems - I don’t think he’s capable of forming friendships.