Brother coming out as trans months ago.. is it legit?

He was comfortable being a male up until he went to therapy and his therapist told him he had gender dysphoria now he went all out on crazy hormones.. his girlfriend encourages it and kind of pushed him to do it. I’m not transphobic I just don’t think he knows who he is.. I’m afraid he’s going to hurt himself.
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The girlfriend has strong political views and is so violently passionate about gay and trans rights that she pushed him into thinking he’s trans. I’m so worried for him, he’s already growing breasts and stuff. I’ve heard horror stories of trans people being f*caked up forever from hormones
Brother coming out as trans months ago.. is it legit?
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