Hi Rubystar,
Firstly, sorry for the loss of your pop.
Secondly, you were generous to extend the offer for your mom and pop to build onto your house. I couldn't do that. My mom would have consumed me. She wanted to move in with us and we said we needed our space. It wasn't even an option for me. She pushed back hard when we told her that, and tried to embarrass and humiliate us publicly. We held our boundary. You made yourself available when they added onto your house. That was kind and generous.
I am sorry for all the angst you are experiencing. The craziness once it starts, seems to feed on itself like a wildfire out of control. I get the sense that things became impossible and you kinda snapped, which led to the blowout you mentioned. Now you are NC, and the peace has given you an opportunity to grasp at a bit of normal again. But things are unfinished, especially with the gifting issues.
My situation with my ubpd mom has been different. So I'm out of my wheelhouse with your situation.
Now that the blow-up has happened, I'm wondering if there is a way to move forward before this fire burns completely out of control over a bigger swath of land . Is is possible to dampen it with some tool like SET, or would it be better to just let it burn itself out? Is this the safest option for you?
What does your family therapist say?
I have had many gold nuggets of advice from my T, but one of them is to take notice of how I am feeling, and if I am on edge/worn out/stressed, to avoid or reduce contact with my mom during those times. The blow ups are negative and hard to recover from for everybody. When I'm feeling on edge, is when I know I have to spend as much time on self-care as possible, to get back to my own baseline. It's kinda the analogy of the parent putting on their own oxygen mask on an airplane in flight, before that of their child.
She stood there so wicked just smirking at us and feeling justified and smug that she finally got me to break down after all these years. I am sure you all know what I am talking about. Then she left to go the pedicure appt that I had made for she and sister and myself for sisters birthday.
Yes I know this smirk. A different T once explained to me that this kind of chaos is her "normal". It fits the box she knows. If things are going along somewhat ok for a time (outside of her box), she has to kick up some dust, create a mountain out of a molehill, and create a little chaos, because that is her "normal" and therefore her comfort zone. Maybe this doesn't fit your situation at all, but it does seem like she was maybe "pushing your buttons" to get an emotional reaction, which she got. I think they do this when they are emotionally dysregulated. I think one of the challenges for us is to not fall into the trap of reacting emotionally, 'cause it contributes to the chaos, which a BPD just feeds off. Nothing good comes of that chaos. Are you familiar with "grey rock"?
I'm kind of out of my wheelhouse with your particular situation with the gifting. It sounds like she is triangulating you and using sis and BIL to do so. She's hurting after she got the emotional reaction she pushed the buttons for, and now she's reverting back to preschool behavior of hurting in return, which in this case is to ask for the gifts back.

Do the gifts have any "title" which have been transferred to your name already? Or are they mostly items of a personal nature?
Where is she moving to? Why is BIL participating in this? What's in it for him? Is he hoping to benefit gift or money wise? Or is he an unsuspecting innocent?
Great idea to get a mediator/lawyer.

Get some solid facts and information. Then consider your options.
The whole thing is classic. There have been many threads on this topic in the time I've been part of this community. You are not alone.
I have never had this much peace in my 50 years as I have in the past 9 weeks and my plan is to remain NC with both of them for the rest of my life. They offer no value to my life and my family (husband and kids) and all of our emotional and mental well being is more important than any relationship I would have with mom and sister.
The message I get out of this is that a change and some respite from her was needed. This is your opportunity to take care of yourself, and take some time for you and your family.

If or when you decide you want to reconcile, it will be up to you because she will never come with an olive branch or an apology. The distorted thinking prevents this. Any time things have gone out of control with my mom in the past, it was on me to bridge the gap between us. Ultimately, each one of knows our situation best, what is safe for us and what isn't, why, and what the consequences of our decision will be either way.
You will find a way through this. Wishing you peace and clarity. Take your time, and just
S-L-O-W things down.
