In my family it's been passed down every generation. It has mostly been all men, except for me. I'm also the only one dealing with it. The rest of them think it's a normal part of life...and in my own opinion...I think it's a little easier to go unoticed in men in men because they are allowed to lose it more that women are, and women have typicaly got to handel the children and keeping up the house. So it seems to me it would be a little less evident depending on how sevear the case is. I'm BPII, and under extreme stress show signs of BPI, so they don't want to label me. But, most of the men on my father's side show signs of BPII. Just enough to come off as too mocho and really obnoxious.