Simpsons did it.
family guy may done this kind of a story before the simpsons, but still had better plot then family guy.
The Simpsons don't really have a black relative. Grandpa just told them that so Lisa wouldn't feel sad that the only good person in their family history didn't sell out. The man probably was brought back to slavery.
didn't they get the story from a library book?
Except The Simpsons did it AFTERWARDS!
And they did it better.
....they still did it.
Technically, "Family Guy" did it first in 2002. "The Simpsons" didn't do it until like, 2009 or something.