I think it is very difficult to diagnose. Being bipolar, I can see how my Dad was for sure, symnptoms/issues very similar to mine. It took them about 3yrs back in the day to initially diagnose me. they went back and forth.. then finally diagnosed me after my 2nd treated mania. Dad was never diagnosed..had several relatives on paternal/maternal side w diagnosed depression.. but other than me, none diag. that I know of. a few cousins on antidepressants, a lot of addiction issues sadly.. they put the tag on my sister who survived a serious brain illness/surgery/ radiation and surgery related long term issues/ then one of the best neurologists in the US laughed and said with her MRI's it was not BPD. Why are they worried so much about your family? they need to treat YOU!