After 20 years of parenting, empty nesters Mike (Patrick Warburton, “Seinfeld”) and Martina (Carrie Preston, “True Blood”) are finally reclaiming their wild side. But when both of their two grown daughters (Miranda Cosgrove, “iCarly,” and Mia Serafino, “Shameless”) unexpectedly move back in and Mike’s parents (Stacy Keach, “NCIS: New Orleans,” and Carlease Burke, “Switched at Birth”) scratch their plans to spend their golden years in Florida, their roost is full again.