Imagine your identical twin saying they are trans? Must be devastating.

It's crazy alright. It's funny though: he's trans, completely TRA-ified, while I'm extremely terfy.

More proof it’s a cult. Your upbringings diverged. Nature vs nurture. There’s no “inherent biological” proof of being trans or else you’d be spouting the same propaganda for sharing identical DNA.

I think you're totally spot-on in believing he was groomed and that you dodged that bullet. I think the same thing sometimes, but with my age instead - there are a lot of women here who believe they would have fallen for the gender cult if they were teenagers right now. It's insidious and preys on some of the most vulnerable people who just want to feel like they are a part of something. I hope your brother finds a way out before doing too much medically.