The three households interact, much like any family would, but each is punctuated with a dialogue directed at the camera/crew. This gives the show a better look into the family dynamics. Instead of just showing the tense relationship between Jay and his out-of-the-closet son, Mitchell, there will be a scene focusing on how the pair interacts, but then the camera will cut to a monologue with each character separately telling how they relate to either each other or the situation. While this sounds like it could be boring, it's often the funniest part of each episode.
This mockumentary way of telling a story isn't particularly new. Christopher Guest does it in all of his movies. However, it is new to a weekly television series. It can be rather difficult to get the storyline across to the audience without getting distracted by the various monologues. Yet it works here. Both the writing and the acting is absolutely brilliant. The show airs on Wednesday nights at 9PM on ABC. I'm not sure if it's available on Hulu, but ABC often reruns episodes. You definitely need to catch this one!