Hi @Moomoola , Ive been following this thread from the beginning. I have teens and this is my worst nightmare and I feel like I've suffered your pain on this journey. I don't have the experience of others on this thread but a couple of thoughts which I hope others will dismiss immediately if I'm totally wrong.
X's mother
It feels like something weird going on here. I can only go on your second-hand words, but she seems oddly passive, oddly happy to accept full costs of another adult person in her home, oddly unbothered by the fact she is, in a practical sense, enabling massive friction in another family. I have wondered throughout if she is on a parallel journey with her own DD, and this scenario is one she is tolerating for some reason in the hope it will play out and resolve something in her own DD...? The latest reference to her mental health also feels significant. It feels like she might be dominated by her DD massively. Somethings not right. Have you or your DH considered approaching the father at all? Asking for a father to father chat? Is he as controlled by X as she is? Are they tolerating all this for a reason we can't see?
X
It definitely feels like coercive control and gaslighting. Your brother's comments are interesting too. It shows X loves a fight, loves the drama, is consumed by the 'activist' element of this cult. I think every comment you make is twisted analysed injected with rage and regurgitated. Your villainy isn't limited to your opinions on trans issues, she's cast you as villains in terms of parenting, your actual lifelong relationship with your DD. How much of the allure of your DD is the drama? What happens if the rope just suddenly goes slack? They are seventeen, what are the odds this relationship lasts forever? What happens if x finds another victim to rescue and save? Where does that leave DD? Still living in the same home while x embarks on a new relationship? Unlikely.
Your DD
I think (possibly) the security of your love for her partly supports this adventure. She's taking so much for granted, and her characterisation of you is unkind.Yes, she is a child, yes she is being controlled, but she is also behaving badly. I think as well as every contact being 'stressful' or 'unwanted', it's also a reminder to her she has options. Both sides want her: you and x.
Way forward
I can't believe I'm thinking this, because this would be unbelievably hard for me to do with my own DD. But I'm thinking you, your DH, your son need to focus on the three of you now, or you will end up like x's mum. YOUR lives dominated by one person (X via your DD) and this toxic harmful ideology.
I would consider writing a letter to DD.
Start with a complete expression of unconditional love. Tell her you are missing her. Tell her to know with 100% certainty that no matter what her choices are, she always has a home with you and your love. Tell her that no matter how she feels in the future - scared, alone, shame, guilt - that you will welcome her with love and provide her with a safe secure space.
Then tell her you accept that she is seventeen. That even though she is still, to you, your beloved child, you accept that you have very little control or influence over her choices or decisions. This is the tough part - tell her you recognise you need to let go. She's on her own, but she can always always come back. Stress this massively.
Tell her your not letting go because you've given up on her, but because you believe your words and love are being manipulated to fuel a drama and make things worse. That this does not serve her well and it is having a terrible impact on the three of you as well.
I would tell her, that because she's seventeen, she is entitled to know the raw truth. That you've given up your job because you've been so concerned about her and have wanted to be available to her; that DH is falling apart, oscillating between fear and anger coupled with work stress; that her brother has retreated into games and silence; that home doesn't feel like a great place right now. Everyone is miserable. I would also add in that you have zero doubt x will tell her this is all emotional blackmail - but tell her she needs to understand that this is why you are pulling back. Not because you are abandoning her, but because life and your home needs to feel normal again. Tell her you've started family therapy and you are now focussing on rebuilding. If she ever chooses to come home, it will be to a welcoming happy healthy home.
If this was my DD, I'd tell her I had three huge fears: one that she'd do something she'd regret for the rest of her life that would permanently change her body and cause her lifelong emotional distress, but that you recognise this love for her and concern is being cast as intolerance and hate. Second, that you are terrified you've lost her and that she's rejected her family, but you now believe continuing to engage makes things worse. Third, that she'd end up in abusive relationship.
I would tell her you fear that the third might be the case. That you fear x is controlling her, manipulating your words against you, conjuring up evidence of villainy out of nothing. Tell her the biggest red flag of coercive control is when someone tries to split their partner away from their family and friends. Tell her to be wary of demands to read her texts on her phone, demands to always be present when meeting other friends. Tell her to be mindful that at the end of the day you are a big- standard normal loving family, not hateful, abusive etc. Tell her she should know that deep down herself.
I would give her a cheap phone and store on it your and DHs numbers, woman's aid and any other numbers that might help her. I would ask her to hide this phone, keep it safe, but see it as a future lifeline if she ever needs it.
Then I'd say goodbye. Reiterate love. Tell her it's up to her from now on to keep in touch if she wishes too, to ask to meet if she wants to. Tell her if you hear nothing from her you will restrict yourself to a single text once a month which you will use to update her on the family.
Gosh - that's long.