“The Bubble.” The filmmaker said back in 2013 that he was interested in revisiting the family at the center of “This Is 40” in a further sequel, especially checking in on the family’s daughters (played by Apatow’s real-life daughters Maude and Iris Apatow).Apatow told TheWrap that the timing is right for “This Is 50,” and he’s been hard at work outlining what the story would be. “I couldn’t have done it five years ago and I can’t do it five years from now, so I’ve been outlining that and hope it’s something that we get to do.