TLDR: I have multiple siblings ghosting me and my parents like a man after sex. And I'm getting the flack for feeling off about me letting them back in. WWYD next time it inevitably happens?
NC for obvious reasons. I have sibling(s) that disappear and go NC for zero reason. I'm not going to speculate on any underlying MH issues etc as they're not open people so could be anything. It annoys me though that everytime they reappear it's when it's in their interests and always with a "Hi! How are you?" rather than admitting they've just gone in the past with no explanation or reason and saying sorry I had something on. I'm quite forgiving 
The problem is my parents both think that I'm 'mean' if I 'call them out' when they get in touch. By that I mean I send a message back saying, 'oh hi stranger! Where have you disappeared to for the last year? Laughing emoji' but apparently I'm not allowed to rock the boat 
I'm also not allowed to bring it up at all. And if I do I'm 'causing an argument' or 'friction'. But tbh im fed up of them actually vanishing randomly, with no row or anything bad said, and popping off when they want something. It could be money, could be they know we can help them get ahead promotion wise, could be they want a house etc. Every time. Then they disappear.
I need to know what to do for next time. Because while I've always been quite 'MN' in my thinking and responses (pointed, but keeping the high ground), I'm always made out to be the one 'causing' problems 
I hope this is clear, I'm on my phone and it's a really small box and probably just looks like a rant 