My BFF wanted to do that with her daughter but now they are at daggers drawn over the fact that mom refuses to refer to her as "they." I tried to reason with her but she doubles down and insists her daughter needs deprogramming because she's in a "cult," that is, of gender fluidity.
Don't ask me, she's a major TERF but my BFF for at least 35 years. We have been through a lot together including the death of her boyfriend from AIDS, my divorce, the death of my first born, my remarriage, children born, and the death of her husband from a massive heart attack.
I get where the daughter is coming from. Her mom's suggestion that she move back to the family manse feels like an effort to reassert control. My BFF is a very controlling person but to me that's just how she is and I work around it. But she's destroying her relationship with her only child. I really feel helpless.