I’m from a big family - we are generally close knit and several of us siblings talk/WhatsApp most days, some of them are my best mates, we are that close.
I am definitely closer to the ones who are similar in age as we have more in common and grew up together, playing, hanging out, etc. but I personally get on with all of them.
There is a big age gap between the oldest and youngest (18 years) they didn’t grow up together as the oldest was at uni when the youngest was born, they love one another but are not close , they don’t really know each other and only see each other once a year at Christmas.
There have been a fair few fall outs over the years , when we were younger and living in the same house on top of one another, it usually involved the same one sibling who just clashed with everyone.
At school , if anyone tried to cause aggro with any of us, the older siblings would be on them like a tonne of bricks, so none of us ever got bullied!
At the end if the day, we all love and care for one another , we all look out for one another, even the ones that don’t talk to each other that often.