They can't control themselves, so they find other things/people to control. My W spirals into these control freak fits, since she is still in-house, it usually revolves around money (especially small amounts) and the kids....Calm, rationality is the only thing that seems to side track the train, at least in my experience, and you sound like you have that down perfectly.
Once (if?) they get control of themselves back, their need to control others dissipates.
Hang tough!
T^2
In the depths of winter, I finally learned that within me there lay an invincible summer. - Albert Camus
Uncertainty is the very condition which impels people to unfold their powers.-Eric Fromm