How would one refer to one's parent's 2nd spouse, whom they have divorced? For example, I have a biological father, and a step-father, but what about the man my mother was married to before my step-father?
I doubt there's a single word for this, but I need some way to refer to him that isn't so cumbersome. Best I have come up with so far is "my mom's second husband", but I feel this really doesn't convey his importance in my upbringing, so I tack on "they were married all the time I was in school", but it's not great.