My step son in law once accused me of only talking about myself and my family, so the next time we were together I just listened and did very little talking and I realised that because they were a family, they talked about things that had happened within the family - past and present and not much else! So if the conversation is on families then the only way I could possibly join in (as an outsider) was with similar stories from my own family!
I felt vindicated, however, I now only speak about my family when specifically asked! (And yes! I find their conversations incredibly isolating - but I am too polite to say so!)