John Stamos is the ultimate bachelor whose life is turned upside down when he discovers he’s not only a father, but a grandfather in this very special preview of the new Fall comedy GRANDFATHERED!

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A coming-of-middle-age comedy – GRANDFATHERED stars John Stamos (“Full House,” “ER”) as the ultimate bachelor whose life is turned upside down when the son (Josh Peck, “The Mindy Project”) he never knew he had walks in to his life and informs him he’s not only a father, but a grandfather.

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Successful restaurateur and man-about-town Jimmy Martino is used to being the most suave, most handsome and most single person in the room. But everything changes with the surprise appearance of Jimmy's adult son, Gerald, and his baby daughter, Edie. Now Jimmy has to unlearn a lifetime of blissful selfishness and grapple with the fact that he went straight from single to grandfather in six seconds flat

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While Jimmy struggles to adjust to his newfound family, Gerald surprises him with plans for the family's first trip to the beach, which excites everyone - except Jimmy. When he decides to bail on the outing in favor of a glamorous pool party nearby, he drags Gerald along, leaving Vanessa and Sara with a chance to get to know one another, for better or for worse.

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When Jimmy realizes that he doesn't know much about Gerald, he decides to take him out for a night on the town. Meanwhile, Annelise hires a new mixologist to spice things up at the restaurant.

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After Jimmy misses Edie's second birthday party, he decides to throw her a big bash at his restaurant to make it up to the family. When Sara's brother (Patrick Fischler) shows up, he brings the party to a screeching halt by confronting Jimmy about leaving Sara to raise Gerald on her own

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When Gerald can't make it in time for Edie's interview at the most elite pre-school in the area, Jimmy steps in to help out. But once he meets the admissions counselor, he accidentally starts a lie that takes on a life of its own.

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In a quest to find his own Amal Clooney, Jimmy goes out with Sara's co-worker, but when she is not impressed with his smooth moves, Jimmy turns to Sara for pointers. Meanwhile, Gerald and Vanessa decide to become friends with benefits.

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In hopes of helping Gerald score with the ladies, Jimmy takes him out for a swanky night on the town. But when Gerald falls for a party girl (guest star Lyndsy Fonseca), Jimmy fears she may be into Gerald for the wrong reasons. Meanwhile, Vanessa starts a mentorship with Annelise.

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Jimmy plans his annual Malibu Thanksgiving day with one of the hottest stomach models on Instagram, but his plans get derailed when he swings by Sara's house for an obligatory holiday visit and feels threatened by the return of her ex-boyfriend, Bruce.

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Jimmy hires Gerald as the new host at his restaurant and gives him a crash course in hospitality. Meanwhile, Vanessa teaches Sara how to take sexy photos for Bruce, and Annelise encourages Ravi to crack down on the comedy in the kitchen.

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After hearing that Jimmy hasn't been to the doctor in more than 10 years, Sara and Gerald trick him into seeing their family doctor for a routine physical, which results in an unsettling discovery. Meanwhile, Gerald and Vanessa stress over Edie's upcoming surgery, and Annelise and Ravi stumble upon Jimmy's secret safe.

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When Jimmy reunites with his old buddies in the "Sat Pack," Ronnie gives him a hard time about his new life as a family man. Meanwhile, Bruce springs big news on Sara, and Gerald is blindsided by Frankie's confession.

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Vanessa and Jimmy get Edie involved in baby modeling - without Gerald or Sara finding out. Meanwhile, at the restaurant, Annelise loses her composure when she falls for a restaurant staff member

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Jimmy organizes a party for a famous pop star hoping that it will improve the restaurant's image. Ravi believes that guacamole could increase reservations.

Jimmy enjoys an evening at a Korean spa with the guys in a effort to prove that he doesn't need validation from women. Sara, Vanessa and Annelise go to a new bar Los Angeles.

Jimmy and Sara are determined to find out who bit Edie at school. Gerald and Vanessa meet with a tech investor but they are not sure they want to do business with him.

Jimmy attempts to protect Gerald from an Internet bully. Sara and Vanessa decide to visit the bully's mother but things get worse.

After Sara asks Jimmy to pose as her boyfriend at her former boyfriend's party, Jimmy realizes he still has feelings for her. Gerald and Vanessa have some doubts their parenting skills after Edie starts to be have badly.

Jimmy ends up feeling out of his depth after he falls for a stunning chief executive officer who is always one step ahead of him.

Jimmy attempts to deal with the realities of being in a relationship. Vanessa and Gerald attempt to balance their lives and their jobs at the same time.

Refusing to admit his real age, Jimmy throws himself a second 50th birthday party.

Jimmy attempts to deal with a painful loss as he plans a memorial service.

Jimmy and Sara think about giving their relationship another a go. Gerald comes up with an elaborate way to ask Vanessa to marry him.