Black sheep in the family? Of course, we all have (at least) one, right?
The main point to consider is: Was your ancestor really a black sheep? Or was it the situation at hand that others judge him (or her) to be a black sheep?
Let’s make an example of: General Benedict Arnold
In American history, he was a turncoat. He leaked troop movements to the British forces of General Charles Cornwallis, and got caught.
In Canadian history, he was a patriot.