Hi lexialpha

Welcome back! Been quite a while since you last were here.
You initially came here because of your uBPD mother, but now also suspect your sister exhibits BPD traits. Your son sounds rather perceptive

How would you currently describe your relationship with your sister? How often do you see her and/or have contact with her?
Many of our members have experience with multuple (u)BPD family-members. I for instance also have an (u)BPD mom and sis and also in my case, my sis was and is considered the golden child by our mother (compared to my other sister).
The Board Parrot