Previously posted in r/AskMen before being redirected here

I'm 21 and transgender FTM (trans man). My beliefs definitely skew liberal, but to no real extremes.

I currently live at home with my parents due to circumstances out of my control.

My brother is 16yo and in his edgy meme phase. But the edgy memes have taken him to new, radical views by habitation. He's gone from making edgy gas chamber, 911, etc. jokes to straight up "race realism," antisemitism, ethno-nationalism, full on "clown world" alt-right beliefs. He's not super Anti-LGBT but refers to people who are less than 100% conforming to gender roles "degenerate," etc.

Obviously, he believes I'm a cucked liberal NPC.

My father is a right wing conspiracy theorist. Not as extreme as my brother, but he's big on the "the Truth ™ the others can't see" shtick. He truly believes that I've been brainwashed into thinking I'm transgender and people are "putting ideas in my head." He believes that Jews are out for Polish blood. Etc. Etc.

We live in Poland, where right wing extremists are currently in power.

My mom is more of a moderate. She leans center right, I think. Definitely has really come around on the LGBT thing.

But the stuff my brother is posting on his Twitter, etc., is straight up terrifying. A lot of it is straight-up rebranded Nazi propaganda (that's Heil Hitler Nazis, not the whole "anyone I don't like is a Nazi" thing), anti race mixing, blaming Jews for everything and making unsubtle (((they))) control the world jokes. "Diversity Macht Frei" spoken cynically is a big thing. Anti-diversity, anti-race mixing. Believes in white genocide and people being low IQ by race. Believes Jews pretend to be white to mix people's minds up.

Im not trying to make him a left wing activist. Hell no. But the stuff he is reposting unironically is way out of the league of harmless edgy/incendiary right wing stuff.

It's scary how fast it goes. It starts with memes. It's insidious and not accidental.

He doesn't tell most of his friends his real views bc they're not "based" enough.

I've tried alerting my mother to it but she doesn't pay much attention. She thinks it's just an edgy teenage boy thing, and I, a "girl", wouldn't understand.

So I'm asking you, grown men who have presumably had an edgy teen phase, and anyone else reading this post, for help.

Is there anything I can do to get him to stop falling deeper and deeper into the alt right radical mill?

Edit: to clarify. I am not trying to convince him to be left wing, or a radical liberal, or a liberal at all. Hell, I wouldn't even demand he respect my sex change or my gender. I just want to nudge him away from "literal refried Nazi propaganda"