Did You Know Him?

At a dinner party in the home of friends, our host mentioned his high school alma mater(母校). One of the guests asked him if he had been a student there at the same time as a particular vice principal.
"I sure was!" answered the host. "He's the biggest jerk(性情古怪的人) I've ever met. Did you know him too?"
"Sort of," replied the guest. "My mother married him last Saturday."