At just over 30 minutes into this episode FBI Agent Peter Burke says ancestor of a person who lived over 200 years ago. Seeing how the person he is referring to is contemporary, the word is descendant. Ancestor is the relative who lived long ago. Descendant is the younger relative. As in he is descended from his ancestor. As we all are.
This is almost as bad as those hundreds of times on television and movies that they say downwind when they mean upwind. I don't understand how these are hard concepts. Apparently they are too stupid to even understand that they are stupid. Otherwise, they may have opened a dictionary and gotten it correct.
Guess what, I am smart yet I frequently check to make sure I have the correct word and are using it as intended.
Now I have a song to sing: I am so smart! S! M! R! T!