Hello Koala323,
Hello - I’m curious if anyone here has tried to help a parent get treatment or diagnosed?
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How explicit or direct have you been with your family members? How did being explicit or direct go? How do we encourage someone who might have BPD to get help? I get that boundary setting is a huge part of it, and I’m doing that. But, what’s next? My mom is still in the dark about why my dad moved out. How do we explain it to her?
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So, have you tried being direct with a loved one? What happened when you did? How long was the journey from you realizing a loved one might have BPD to them hearing you and then maybe, maybe accepting it/getting help?
I have suggested to my uBPDs, both lovingly and angrily, that she seek qualified professional treatment. Obviously when I've suggested it in anger in response to raging behavior of hers, it hasn't worked.

She DARVOs on me (
https://dynamic.uoregon.edu/jjf/defineDARVO.html). But it also hasn't worked when I've suggested it in loving ways. She doesn't recognize that she has the disorder. She feels she's already in therapy for other issues - but her family doesn't think the therapist she's seeing is capable of treating such a difficult disorder.
There do appear to be a couple of videos on this topic (how to suggest therapy to a pwBPD) linked from the pinned "Lessons" topic in this discussion group - see
https://bpdfamily.com/message_board/index.php?topic=108307.0.