(((iamsoblind))))
You are such a smart and capable woman. I know you are crumbling inside but you are maintaining a level-headedness in your approach and actions that is admirable. Really.
I'm not going to respond to every piece of this... There's just too much. I'm just going to respond on the pieces that I feel I have some similar experience with -- in hopes that it might provide some reassurance or whatever.
The WH taking the kids furniture shopping... I wouldn't worry about it too much. Honestly. My youngest DS (12 at time) helped my WH shop for things he needed for his apartment and helped him assemble things and move in. Slept over. It was very reassuring to my DS. He was the only kid who didn't know about the A. The other 2 wanted no part of it. The youngest needed to know that he would still be part of H's life and although it was killing me, I could see it was helping to calm him. And my worry over him was greater (typical mom reaction, right?)
My DS15 eventually spent a couple nights at the apartment. My DD17 has never been there and will never be. She's the most angry and devastated about this because she confronted him and he didn't stop.
Their different wishes for R vs. D brought a lot of extra friction into their relationships with each other and also with me.
Based on my own experience, I think it is probably reassuring for your DD to be part of this. And I think your DS is awesome to try to be strong to help her, despite his own feelings. I've seen that my kids have phased through different stages with this whole thing and are finally getting to where they are trying to support each other. Awesome that your DS is doing this from the get-go. Really. It's good for them, even if it hurts you.
Also, a big shift in their interactions came when our new MC/IC/FC wanted to see them all together. My DD was livid. She liked going to her own shrink and venting and hating on WH. DS15 didn't want any C. I told youngest DS about the A late September 2013. It was too likely he had already ascertained the story and I wanted him to hear it directly from me. He was almost 13. Kept it very age-appropriate, based on advice from MC/IC/FC #1. He was shattered, but bounced back and is very rational about it.
Having them do FC as a group had been amazing. They are relating better and not feeling so isolated in their emotions. New C has seen them once and wants to see them alone again. Full family FC will be later down the line. In the meantime, I can see how it's helping.
I'm not trying to t/j with my story, but hoping you may see something in my story that will help you with your kid's healing. I would highly suggest C for them. IC made my DD more angry and self-focused. Her shrink told her she could set "rules". It wreaked havoc on our family dynamic. The group approach, with a different mindset C, is working for us.
I can't tell you what's best for you... Just some more thoughts that you can use as you need or disregard.
I know how devastating it is when our kids become part of this nightmare. Like you, I want desperately to do the right things for them. Hard to give them the necessary first aid when you are lying on the floor hemmoraghing. BTDT. My DD was angry at me for that too. Be kind to yourself. Just like on an airplane, they tell you to put on your own oxygen mask first, then your kids. You can't truly help them first. YKWIM? Forgive yourself for having to do your own triage first. It's okay. You have time to help them heal. Be good to yourself first. Then start attending to their healing.
I know it's hard to see your family devastated by all this. First hand. I feel for you.
You've got double/triple betrayal on top. The pain is excruciating. But we are all here, hoping to help you through it in some way. We'll add little bits and pieces of our own experiences and sometimes (unfortunately) project our own feelings on to your situation... Please know that everyone here wants to help. Not judge. Not belittle. Not distrust. In your case, I think the clarification helped us better understand the likely situation between WH, AssH, and BFF. Like I wrote early on, it just seems impossible that this just "happened" spontaneously while you were gone 15-20 minutes. I think your added detail just solidified that for most of us. With that knowledge, we may be able to offer better insights. I hope that makes sense. Keep posting and talking.... And hang in there.
You. Will. Be. OK.