Hi Cmaley82,
and welcome aboard!
I am sorry to hear your family has issues that are causing you pain. I would also applaud you for taking a hard step in going NC with your mother. Your boundaries are so important to uphold and the fact that your mother kept choosing not to respect this says a good deal about her view of the r'ship. I'm sure it was a hard decision to make nevertheless I hope you have benefitted from it.
You do owe loyalty to your wife and it is not fair on her for your mother to be blaming her for the difficulties within the family, although it is a classic BPD behaviour.
Have you found things improved at all after going NC? I suppose at times it must feel sad for you as it is in a very real way a grievous loss.
Families that have disordered ones within them often have mistrustful and destabilised r/ships between the other family members. There are dynamics which produce this as you have already seen with your father's behaviour and your lack of trust in your sister.
You may get further understanding by having a look at this:
https://bpdfamily.com/bpdresources/nk_a108.htmAlso the link clljhns has posted there is excellent for gaining perspective. As she mentioned the library is really good.
Hope you will let us know what you think.
Thank you for sharing your story
Ziggiddy