Is NOBODY wrong in the post ? POST : To preface things, my extended family is all very close to us so the relationship I have with a lot of my cousins is like some people have with their siblings. 

A couple years ago, my(F18) twin cousins (F24) broke of all communication with their parents, their little brother(M17), and the entire extended family. It was really sad for all of us, especially since we had spent a lot of time with them in the last couple years (before the split) in organizing their weddings.

Flash forward to now and I still don't know what happened to make them never want to see their parents again. This issue bothers me a lot because of the unknown nature and I frequently have dreams about them and how much they supported me.

I miss them and I don't know whether to be sympathetic to their parents or not because no one will tell me what happened. Before, they were keeping things tight-lipped and only the twins' parents and brother knew why they had blocked them out. But now a couple years later people (my parents, my other aunts and uncles, my older cousins) are starting to find out. 

My older brother(M30) knows but he won't tell me. He says I should mind my own business and stop asking questions because it's the family's private situation. But to me it's not private, we were raised as one big family and told to hold on to each other so why does that end now? They were like sisters to me but I still have to be left out in the cold? 

So AITA for trying to find out why? Can someone explain to me why I don't get to know? I'm sorry I'm just genuinely isolated in this and I'm one of the youngest in the extended family so people tend to discount me. 