No, there is no alcohol or drugs involved, fortunately. I do agree that she has dysfunctional behavior/thinking -- but I think her manipulative behavior is perhaps the biggest problem of all.

I do think my dad has dysfunctional behavior/thinking too, in all fairness. He could benefit from a therapist. After all, his mom (my grandma) had bipolar 1 w/ psychotic features, which she was diagnosed with when she was involuntarily committed. (I drove her to IP.) I don't know if my dad has bipolar, but mental illness seems to run in the family, as does dementia (although I've heard mixed things about certain types of dementia being hereditary or not).

I know I'm not a doctor, but my sister seems more of the BPD type because throughout the day, she switches from elation and recklessness to crying and feeling hurt over minuscule things. But it's possible she is just manipulative and wants us to think she's crying and feeling hurt. I honestly can't tell because she manipulates so much. That's why I'm never sure if she is legitimately hurting or if she just is trying to f*** with us.