I have a big family due to divorce/deaths so would say there are underlying issues that are not addressed.
But one thing that I can really see a strange trend is how each family group always seem to have to have an issue with another group. What makes this strange is when they fall out with one group they suddenly become back friends with another who they have been fallen out with previously. This has been going on for years in circles. So right now DB has fallen out with DM and DF, another DS and also us apparently. Yet at the same time made friends with his other sister who he hasn't spoke to in about 6 months. The reasons for falling out are often vague or due to a comment made.
I don't think there has been a time when all the family are actually getting on. I have tried to stay out of it as best I can but often get accused of not making effort as I obviously step back/avoid being with people too much.
Has anyone else ever experienced this with friends or family? I like to understand the reasons behind why people behave the way they do but this always baffles me. It's like they have to have enemies.