I have mixed feelings about this (and the previous) episode. There are a few laughs and funny situations, though it is not great. But more importantly, the overall tone just seems to be wrong. It feels like some kind of a failed experiment to bring a new direction in the show. Frank and Marie have moved... no, wait, they haven't. As some of the other reviewers have said, this episode, if put together with the previous, could have made a great finale. Frank and Marie have moved, Ray and Debra have new neighbors, with the possible hint that the new neighbors could be just as annoying to them as the previous ones. Or even show that Frank and Marie have been kicked out of their retirement condo, but end it with them showing at Robert's door, and end the show that way. It would have been funny and meaningful.
Also, there is a thing that doesn't make sense. Robert bought the house, it is his now. Even if he felt the obligation to give it back to his parents, there is no need for him to stay there, and he is not without money, as they make it out to be. If Frank and Marie get the house back, Robert should get his 26000 dollars back, and that should be plenty of money to rent a place of his own.