Our sons lead very different lives, differing work patterns, interests, career choices and have very different personalities. They do 'see' each other on Facebook, mostly about cars or children I suspect. There is a family WhatsApp group for us all, which helps us keep in touch as we don't use Facebook. I do notice our daughters in law are in touch with their sisters far more than our sons contact each other, they seem much more intuitive with each other, both are very good at remembering birthdays fortunately. We do have family time, usually for birthdays and Christmas, they try very hard to be there, currently trying to plan a weekend together, a logistical nightmare! I was an only child so didn't have a clue how siblings might get along. I have seen that if one of them was in trouble the other will do all they could to help. I've concluded that means a lot and their relationship works for them but, yes, sometimes I'm sad and wish it were different.