One of my friends who I wouldn't expect to be trans, came out to me and in their words said "I want to be a woman". They have had a female alias they go by. Now, this person has suffered damage to the head from an accident, but they had this alias since before the incident. They grew up being taught there are two genders and two sexes and that they were connected, which of course isn't true but that's how this person was "taught". Sex ed even in a more liberal state didn't help either, and insisted on the "only two genders" line of thinking. So their line of thinking is "I'm a man, now but I want to become a woman". They also see me as "a woman that wants to become a man". I honestly don't know if they have the wherewithall to understand the bunk behind this reasoning and that being born with the wrong plumbing doesn't make us "not a real man/woman". They don't have a problem using their birth name or male gender pronouns. But they have mentioned getting SRS if they could afford it, and again, "wanting to be a woman".
Now, the wife is very straight, only attracted to cis males. This person is also "special needs" mentally and literally cannot grasp the concept of being trans. To them, if you were born with a penis, you are male, born with a vagina, female. They grew up with VERY homophobic and transphobic parents who told them these things are sins and send people directly to hell, that it's a degrading, horrible thing to be gay or trans. Ugh. So the partner just repeats what she was told by the parents.
My question is, how can I be supportive of this person without causing them all kinds of chaos and relationship problems? I don't know if I could ever get the partner to grasp the concept, let alone make them ok with it. The wife knew about her husband having a female alias and wearing women's clothing before marrying him, but insisted on marrying because that's what you do after you've been together for awhile, in her words. Now she's angry and saying "I didn't marry a woman, I married a man!" I don't want to cause more problems for this person, but they need information and support.