I have a strained relationship with my DB. In short, he doesn't seem to have any interest in the world outside his nuclear family. I understand that this is probably quite common when you have children (I don't). We have a family whatsapp group, where he regularly shares pictures and news of his children, but it's not reciprocated at all.
I don't think my DB knows what job I do, anything about my house (we've moved overseas and has never visited, which is fair enough), where we've been holiday, what my wife does, her family, or even the boring details (what we watch on TV, what brand of coffee we drink, if we've seen any good films). When we got married, he didn't come (admittedly it was on mainland Europe, but not a million miles away, and he had a save the date a year in advance).
Any conversation is entirely one-way. It's not just me. My parents find the same. They see each other regularly and talk on the phone, but he never asks questions. My parents can say "Oh, I had to go to A and E this week", and my DB will just say "oh right", and that's it. When they ring, he largely imparts his news and that's it.
He's my only sibling, and I want to have a relationship with him, but I find it so difficult. Anyone else have a similar experience, or can shed any light on why he might behave like he does?