Hi Singapore, all great questions and I'm glad you got the laptop set up. Please keep asking the tough stuff!
Any suggestions on how to convince my wife to involve a third party? I'm keeping fingers crossed that the priest idea will stick but I have little confidence.
How do we convince anyone to do anything that they don't want to do? That might sound discouraging, but if your wife is against therapy then it will be very hard to "convince" her of anything.
A different tactic would be to talk about your own needs and ask your wife to problem solve. Asking something like, "I feel unseen and neglected in this relationship and I can't keep doing this. What can we do differently?"
When I told my ex wife that we needed therapy, she refused. When I asked her what we could do a week later, she suggested therapy. So I found a few therapists and she refused them all. I asked her, which therapist would you like to see? She said she'd think about it (which means it will never happen). So I told our daughter, who my wife listens to, that there was a Christian therapist only a few miles from where my ex wife was staying. Suggest that to your mom. She did and it was suddenly a great idea.
My point here is that you can't fight this in conventional ways because we're talking about mental illness. Your wife thinks differently and responds accordingly.
It bothers me that there is no diagnosis. Thinking that if there were a label, she might be motivated to get help.
Again, you're thinking about this logically how you'd feel if a physician gave you a diagnosis. So many here hoped for the exact same thing (myself included), if we get a diagnosis, then we can fix this and live happily ever after. That probably won't be your wife's reality though and even when diagnosed, there's a chance she rejects or ignores it. In other cases here on this site, the diagnosed person uses it as a sword..."You know I'm crazy and it's not my fault. You should have known better to ask me that!"
All in all, the diagnosis doesn't mean a whole lot. It's a starting point only.
Thoughts on how to manage these dynamics, not either demonising their mum nor (any longer) normalising her behaviour, and give them the tools to live lives that don't involve mirroring either parent?
My ex wife is nor officially diagnosed either (other than chronic depression), while my oldest daughter is (BPD/bi polar). Their behavior is identical though. And when I talk about my ex, I tell others that she's struggling mentally and thinks differently at times due to stress and anxiety. People accept that whether they know about BPD or not.
All these are abstract, not concrete, issues but it is as if I'm standing in front of a tree. Anyone else can see, "yep, that's a tree", but she will deny the tree's existence. What IS that?
When arguing with a BPD, it's so easy to think about facts and defend them. But they're thinking emotionally, not logically, and their feelings control their emotions so much more than the average person. Your wife is thinking, "Today is horrible and I'm struggling, why can't you see that?" Yet she says, "You never do anything for me."
Notice it's two completely different things, because she couldn't possibly admit what she was actually feeling. So she deflects expecting sympathy, even though she just attacked you verbally. You don't respond with sympathy because you're not a mind-reader, and now she's thinking, "The nerve of him to talk to me that way when he knows how bad I'm hurting inside."
Can you follow this at all? It's so critically important for BPD relationships.
When your wife says something out of the ordinary, or when she's in "one of those moods", she's speaking emotionally from mental illness. The way through these situations is not to justify, defend, or argue, it's to ignore her words completely and focus on her emotions. If she's panicking, calm her down. If she's sad, cheer her up. If she's angry, help her relax with affirming words and body language.
This might sound familiar since you did it with your kids when they were infants. It's basically the exact same thing since all you have to go on is the emotions present. If the baby cries, you try to make it laugh.
I feel intense grief and guilt for allowing this to go on so long, often dragging friends and my family into spirals of dysregulation and not protecting the girls as I should. What's wrong with me that I have let this happen?
There's nothing wrong with you. You love your wife and you want things to work out, even though you don't fully understand what's happening or what to do. We've all been there and did the exact same thing.
On this site, we talk about our BPD loved ones often. But as you're here for a little while, you're going to realize that this site is more about you and your mental stability while dealing with a tough relationship. Nobody here can "fix" your wife, but we can help you learn tools that makes communication a lot less painful. Over time, it makes a tremendous difference as you learn to "speak her language"....which is about focusing on emotions instead of logic and reason.
I hope that helps my friend!