Howdy,
I work in a library, and I love to read, so frequently I find myself checking out the books I'm supposed to be shelving. The other day, I was putting away a book about BPD. I started reading it and realized that it was describing a lot of negative behaviors/traits I've noticed in my mom over the years. She has never been diagnosed, but I thought some of the communication strategies in the book might help me communicate better with her. However, as I read I'm seeing many examples of relatives trying and failing to validate (which is basically what I feel like I've been doing my entire life). It all just feels sort of... .exhausting. Also, and I hate to say this, but there's a big part of me that feels like I'm the one who puts all the effort into our relationship and I get very little out of it.
Here are some behaviors that I've observed over the years from my mom:
1. alcoholism (and possibly, now, addiction to pain killers) and chain smoking.
2. anger/rage issues (road rage, too, oh boy!)
3. entitlement. massive, major entitlement
4. repeating past mistakes/inability to foresee consequences/apply logic
5. ascribing strange meaning to seemingly innocent conversations. Most recently my 4-year-old told my mother, "I like your house, nana" and she called me later, drunk and ranting that he said that because he's never seen her house before (not true, although I do limit their time together.)
6. inability to maintain romantic relationships. When I was a child I had a scrap book of all my mom's ex-boyfriends (so I could remember them all). When she loved them, I had to love them too. When she hated them, I had to jump onto the hate train. I had a very hard time trusting any of the new men she brought home and resented having to call them dad.
Any and all advice welcome.

My strategy at this point is just to take her in small doses and try to hit periods of sobriety, however, she is very angry and resentful that she's not allowed "full grandparent privileges," namely we don't allow him to be in her house alone. I often feel guilty about this, but I have a very supportive and loving partner who constantly reminds me that we have the right as parents to determine a safe environment for our child.
Seems like it would be a lot easier if she'd just acknowledge she has a problem, but as far as she's concerned everyone else in the world is persecuting her.