From the research that I have done on this subject I have tracked it down to the family of "Turrets". I know, sounds stange. Turrets is like the grand daddy of it all. It all has to do with Serotonin and the way that the brain/body deals with it.
Grandmother on father's side: Depression/OCD/eating disorder/sleeping disorder
Father: Depression/OCD/sleeping disorder/control freak which tied in with the OCD
Mother: Depression/OCD/sleeping disorder/denial of life
Four brothers and sisters:
Sister: bi-polar/depression/borderline personality (psychotic)/eating disorder
her daughter: all of the same traits
Brother number one: Disabling Turrets/Depression/OCD/addict
two of his sons: depression/OCD and a stomach disorder that is life threatning caused by stress that is due to his misguided thinking that he is never good enough, self imposed.
Brother number two: depression/OCD/controlling (deceased)
three of his sons:same symptoms/addicts
Brother number three: depression to the point of suicide/OCD
Brother number four: depression/OCD/addict
myself: depression/OCD/addict/eating and sleeping disorder
two daughters: OCD/depression/one is an alcoholic (Her son was diagnosed as having OCD at a very early age when instead of playing with his Legos he sorted them by color and size and wouldn't let you mix them up.)
The other daughter is on anti-depressants. Her son shows no signs of any problems.
So, it appears to me, through looking through our family tree that the nuts don't fall far from the tree