Audrey attempts to stop her brother from marrying a young French woman during their rescheduled wedding weekend in the Hamptons, which happens to be the same weekend she turns 40.
Unfortunately the movie Sister of the Groom is not yet available on HBO Max.
| Production | Alicia Silverstone | Executive Producer |
| Costume & Make-Up | David Anthony Crowley | Costume Designer |
| Production | Amy Miller Gross | Producer |
| Art | Eve McCarney | Production Design |
| Production | Andrew Carlberg | Producer |
| Production | Tim Harms | Producer |
| Sound | Jay Lifton | Music |
| Sound | Lee Reitelman | Songs |
| Production | Jessica Kelly | Casting |
| Editing | Abbi Jutkowitz | Editor |
| Production | Justin Scutieri | Co-Producer |
| Sound | Katy McIlvaine | Music Supervisor |
| Production | Kate Geller | Casting |
| Production | Jennifer Wyatt-Beasley | Line Producer |
| Crew | Mark Blum | In Memory Of |
| Directing | Andreas O'Donohue Villaggio | Second Assistant Director |
| Camera | Charles Libin | Director of Photography |
| Directing | Heather I. Denton | First Assistant Director |
| Camera | Peter Westervelt | First Assistant "A" Camera |
| Production | Justin Scutieri | Production Supervisor |
| Camera | Ben Noftzger | "B" Camera Operator |
| Camera | Nicalena Iovino | First Assistant "A" Camera |
| Art | Heidi Strykiewicz | Set Decoration |
| Camera | Brian Bonilla | Second Assistant "A" Camera |
| Camera | Travis Libin | "C" Camera Operator |
| Camera | Josh Broaden | Camera Production Assistant |
| Camera | Kenneth Kildee | Key Grip |
| Camera | Ryan Coleman | Grip |
| Camera | Max Bayarsky | Grip |
| Camera | Chris Cobo | Grip |
| Camera | Milah Libin | Still Photographer |
| Directing | Janissa Ramirez | Script Supervisor |
| Lighting | Lori Dinsmore | Best Boy Electric |
| Sound | Roger Kean | Boom Operator |
| Camera | Michael Parry | Grip |
| Lighting | Andrew Hubbard | Gaffer |
| Crew | Matthew Atwood | Generator Operator |
| Camera | Katie Nahri | Second Assistant "B" Camera |
| Crew | Randy Slavin | Drone Operator |
| Camera | Matthew Tompkins | First Assistant "B" Camera |
| Sound | James Weidner | Production Sound Mixer |
| Camera | Charles Miller | Digital Imaging Technician |
| Camera | Levi Sherman | Dolly Grip |
| Camera | Logan Mitchell | Best Boy Grip |
| Lighting | Jordan Tetewsky | Additional Gaffer |
| Crew | Josiah Nolan | Stunts |
| Costume & Make-Up | Alex Weston | On Set Dresser |
| Lighting | Tamur Qutab | Electrician |
| Production | Beth Crudele | Art Department Production Assistant |
| Crew | Nicole Dinonno | Stand In |
| Lighting | John Zeng | Electrician |
| Art | James Boxer | Set Dresser |
| Camera | Hunter Zimny | Additional Key Grip |
| Art | Lauren Olson | Assistant Property Master |
| Art | Neal W. Zoromski | Property Master |
| Art | Ruben Chavez | Leadman |
| Crew | Akos Schenek | Stunts |
| Lighting | Jim Barber | Electrician |
| Crew | Manny Siverio | Stunt Coordinator |
| Costume & Make-Up | Christopher Opopo | Costume Supervisor |
| Costume & Make-Up | Natalie Che | Additional Hairstylist |
| Crew | David Shumbris | Stunts |
| Costume & Make-Up | Jeremy Bramer | Makeup Department Head |
| Directing | Anthony Melino | Second Second Assistant Director |
| Costume & Make-Up | Lauren Citera | Hair Department Head |
| Crew | Karen Barnes | Stunt Double |
| Costume & Make-Up | Aedel Park | Key Hair Stylist |
| Production | Ryan Warner | Location Assistant |
| Crew | Jaime Wallace | Stunt Double |
| Production | Sara Furey | Location Manager |
| Production | Suzanne Koneful | Location Manager |
| Production | Sylvia Fay | Extras Casting |
| Costume & Make-Up | Justin Curges | Costumer |
| Costume & Make-Up | Melissa Eastwick | Key Makeup Artist |
| Production | Corey Asraf | Location Assistant |
| Costume & Make-Up | Katherine Kalbacher | Costumer |
| Production | Rachel Armiger | Production Coordinator |
| Costume & Make-Up | Courtney Stephens | Costume Supervisor |
| Costume & Make-Up | Jacquelyn Taylor | Additional Hairstylist |
| Costume & Make-Up | Aaron Ramey | Costumer |
| Production | John Galloway | Location Manager |
| Production | Skyler Tapley | Assistant Production Coordinator |
| Production | Sean Martinez | Location Assistant |
| Production | Sydney Stewart | Key Set Production Assistant |
| Production | Sunny Crist | Production Accountant |
| Production | Christine Nelson | Casting Associate |
| Production | Zulu Aljaeri | Production Assistant |
| Production | Tyler Foltz | Production Assistant |
| Costume & Make-Up | Mary Chipman | Additional Hairstylist |
| Directing | Courtney Fusselman | Additional Second Assistant Director |
| Production | Timothy P. Smith | Production Assistant |
| Crew | Jonas Lopez Martinez | Assistant Chef |
| Sound | Giuseppe Cappello | Sound Effects Editor |
| Production | Guillermo Barreira | Production Assistant |
| Crew | Justin Scutieri | Post Production Supervisor |
| Crew | Pascal Besse | Assistant Chef |
| Editing | Thomas Mitchell | Assistant Editor |
| Sound | Ray Quintana | Foley Editor |
| Production | Patrick McNally | Production Assistant |
| Sound | Brahm Patel | Foley Recordist |
| Sound | Vincent Deng | Foley Artist |
| Sound | Jonah Scott | Music Editor |
| Sound | Sylvain Pierre | ADR Mixer |
| Crew | Stephane Pain | Set Production Assistant |
| Crew | Jeff Schultz | Set Production Assistant |
| Production | Chad Russo | Attorney |
| Sound | Ian Gaffney-Rosenfeld | Sound Re-Recording Mixer |
| Sound | David Fallo | Musician |
| Production | Linskey Sylvester | Production Assistant |
| Sound | Ray Quintana | Foley Mixer |
| Crew | Syimphfinni Armamourne | Set Production Assistant |
| Sound | Josh Murphy | Foley Artist |
| Sound | Bryan Brundige | ADR Recordist |
| Sound | Aaron Heick | Musician |
| Crew | Joshua Stearns | Assistant Chef |
| Crew | Richie Christie | Transportation Captain |
| Sound | Patrick Christensen | ADR Mixer |
| Sound | Nikola Simikić | ADR Mixer |
| Crew | Carly Rutizer | Actor's Assistant |
| Crew | Sara Nishumura | Set Production Assistant |
| Crew | Scott Barter | Set Medic |
| Sound | Daniel Timmons | Supervising Sound Editor |
| Sound | Joshua Perkins | Foley Artist |
| Visual Effects | Blake Goedde | Visual Effects |
| Visual Effects | Stuart Racey | Visual Effects Producer |
| Crew | Jonah Scott | Additional Music |
| Sound | Alan Stevens-Hewitt | Musician |
| Sound | Benno Calmbach | ADR Mixer |
| Crew | Esteban Garces | Compositor |
| Crew | Lucas Solomon | Thanks |
| Crew | Jay Glazer | Thanks |
| Editing | Ethan Leight | Digital Intermediate Producer |
| Crew | Mark Foscolo | Compositor |
| Crew | Krupali Parikh | Compositor |
| Sound | Lee Reitelman | Musician |
| Sound | Sarah Hewitt-Roth | Musician |
| Visual Effects | Dan Pochtrager | Compositing Supervisor |
| Crew | Rosario Varela | Thanks |
| Sound | Jonah Scott | Musician |
| Sound | Suzy Perelman | Musician |
| Editing | Nat Jencks | Colorist |
| Editing | Gil Litver | Digital Intermediate Assistant |
| Sound | Jay Lifton | Musician |
| Sound | Adam Clairmont | ADR Recordist |
| Visual Effects | Pete Sussi | Visual Effects Supervisor |
| Sound | Yuko Naito-Gotay | Musician |
| Sound | Brian Griffin | Musician |
| Production | William O'Brien | Assistant Location Manager |
| Visual Effects | Jean-François Beaulieu | Compositing Lead |
| Directing | Amy Miller Gross | Director |
| Writing | Amy Miller Gross | Writer |
| Crew | Tony Nieves | Craft Service |
| Crew | Damon Samuel | Craft Service |
| Crew | Thaddeus Brown | Catering Head Chef |
| Crew | Jonah Scott | Score Engineer |
