For perspective, I'm adopted. Maybe more of a rant than an AIBU because I'm pretty certain I'm not!
Just found out my 'family' are having a 60th birthday party for F tomorrow night, family get together, all siblings (their own children) going. Nothing had been said to me, I found out from F's sister who asked how I'm getting there. Asked M about it and apparently it has been planned for weeks but I wasn't asked as they presumed I'd have plans (I don't). We don't have a bad relationship (now anyway, childhood was not the best), no arguments and we see each other weekly as I do their weekly shop! M said I can come if I want, but I'm not going to as I'm obviously not wanted (didn't say this).
I am hurt. Really hurt. I've had to go have a little cry in the work toilet, I was made to feel separate and left out throughout my childhood but I thought that was in the past. Would it be unreasonable to tell them to fuck off next time they want something?