This is:
We have a aunt at work, who at one time drove her current husband out of the family, and she was not free at that time. They destroyed two families."

I always liked to think of men as some kind of animal that anyone can take away. Maybe it was he who brought her to her husband.
Well, if you have such a strange arithmetic, you have destroyed 2 families, but you have created one, so only -1, not -2.