There's a few of us, and its a mash up of relationships...
The eldest three are/were more than 10 years my senior. And while my brother was also quite authoritarian, he and I were close since I was born. He was the first sibling I bonded with, growing up and into my teens I talked to him about anything and everything.
It killed a part of me when he died.
The second eldest is a sister, our relationship has waxed and waned over the years as she's forged a family of her own and tried to adapt to my different phases of growth. We have a good relationship though, we talk about everything, have girls nights, go for coffee and geez she can talk for over an hour on the darn phone!
Then there's another older sister, sibling rivalry growing up, but as adults we came to realize we have alot in common and have made a concerted effort to become friends. We have a very good relationship now, even got matching tattoos for my bday.
Then there's a brother just before me, I hardly ever mention him because I have cut all ties with him. He's toxic
Last but not least my younger brother by 6 years. I couldn't stand him when we were children and now he's my best friend.
So yes, there are definitive relationships between my siblings and I.