^ Yes. I did a little internet search but didn't find much.
Here is my take.
The premise of the show is inherently incestuous:
Family business.
Entire family lives with each other.
And I think it the point in which the incest theme really kicked off was when Maybe kissed George Micheal. I would guess the writers realized how this theme could be extended to other characters as well. Or maybe they had it planned the entire time. Incest was pretty much untouched territory in television at the time, but the characters on the show allow the writers to portray incest in such a hilarious way. IDK. This might be BS. You asked a good question.
Either way, this was the funniest show on television and I still cannot believe it got cancelled. I'm praying the movie rumors are true. I'm actually going to watch a few episodes on netflix right now...