Your mom falls into the "is blind" category, then. Mine took a couple of years to realize she had a daughter, but she figured it out. There's no gene, no biology, that'll ever change a transphobe's mind. Insert the Sartre quote about antisemites here.

At some point you're going to very visibly be a woman. You will be a woman socially, maybe legally, and eventually the transphobes in your life just look like doddering fools. Why are you calling your daughter, your son? Are you experiencing dementia?

There is no evidence good enough, especially not for family like that. You could wake up a literal zebra tomorrow and they'd still be calling you human. Either your people respect you for who you are, who you show yourself to be, or they're not actually your people. Transition puts into sharp focus who actually gives a shit about you and who was just tolerating you because you played a particular role for them. Now that you're not, they'll try and shove you back into that role. They're not worth keeping in your life. If they do realize what they're doing and why it's fucked they will come back and make amends.

I've seen 90+ year old grandmothers who were set in their ways accept their daughters for who they are. What excuse does anyone younger and of sound mind have?

I think Im feeling resistant towards this, and I shouldn't youre just feeling some stuff, because it does feel very transmedicalist and bioessentialist

Which I dont think is what youre doing!! I feel like my proverbial hockles are going up like a dog seeing a threat cause it feels so close to terf-style things.

There is no brain region and no external test, youre trans femme because you want it. And that freedom is scary and its exhilarating and joyful. I had a lot of confidence and "fuck off no one tells me what to do" in me when I transitioned and its only grown which is probably why I never wondered if there was a test