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 |
| Production | Amy Miller Gross | Producer |
| Production | Andrew Carlberg | Producer |
| Production | Tim Harms | Producer |
| Production | Justin Scutieri | Co-Producer |
| Production | Jennifer Wyatt-Beasley | Line Producer |
| Camera | Charles Libin | Director of Photography |
| Art | Eve McCarney | Production Design |
| Costume & Make-Up | David Anthony Crowley | Costume Designer |
| Editing | Abbi Jutkowitz | Editor |
| Sound | Jay Lifton | Music |
| Sound | Lee Reitelman | Songs |
| Sound | Katy McIlvaine | Music Supervisor |
| Production | Jessica Kelly | Casting |
| Production | Kate Geller | Casting |
| Crew | Mark Blum | In Memory Of |
| Directing | Heather I. Denton | First Assistant Director |
| Directing | Andreas O'Donohue Villaggio | Second Assistant Director |
| Art | Heidi Strykiewicz | Set Decoration |
| Production | Justin Scutieri | Production Supervisor |
| Camera | Ben Noftzger | "B" Camera Operator |
| Camera | Peter Westervelt | First Assistant "A" Camera |
| Camera | Nicalena Iovino | First Assistant "A" Camera |
| Camera | Brian Bonilla | Second Assistant "A" Camera |
| Camera | Matthew Tompkins | First Assistant "B" Camera |
| Camera | Katie Nahri | Second Assistant "B" Camera |
| Camera | Travis Libin | "C" Camera Operator |
| Camera | Josh Broaden | Camera Production Assistant |
| Camera | Charles Miller | Digital Imaging Technician |
| Crew | Randy Slavin | Drone Operator |
| Camera | Milah Libin | Still Photographer |
| Directing | Janissa Ramirez | Script Supervisor |
| Sound | James Weidner | Production Sound Mixer |
| Sound | Roger Kean | Boom Operator |
| Camera | Kenneth Kildee | Key Grip |
| Camera | Logan Mitchell | Best Boy Grip |
| Camera | Levi Sherman | Dolly Grip |
| Camera | Ryan Coleman | Grip |
| Camera | Chris Cobo | Grip |
| Camera | Michael Parry | Grip |
| Camera | Max Bayarsky | Grip |
| Lighting | Andrew Hubbard | Gaffer |
| Lighting | Lori Dinsmore | Best Boy Electric |
| Crew | Matthew Atwood | Generator Operator |
| Lighting | Jim Barber | Electrician |
| Lighting | Tamur Qutab | Electrician |
| Lighting | John Zeng | Electrician |
| Camera | Hunter Zimny | Additional Key Grip |
| Lighting | Jordan Tetewsky | Additional Gaffer |
| Art | Ruben Chavez | Leadman |
| Costume & Make-Up | Alex Weston | On Set Dresser |
| Art | James Boxer | Set Dresser |
| Production | Beth Crudele | Art Department Production Assistant |
| Art | Neal W. Zoromski | Property Master |
| Art | Lauren Olson | Assistant Property Master |
| Crew | Nicole Dinonno | Stand In |
| Crew | Manny Siverio | Stunt Coordinator |
| Crew | Josiah Nolan | Stunts |
| Crew | Akos Schenek | Stunts |
| Crew | David Shumbris | Stunts |
| Crew | Karen Barnes | Stunt Double |
| Crew | Jaime Wallace | Stunt Double |
| Costume & Make-Up | Christopher Opopo | Costume Supervisor |
| Costume & Make-Up | Courtney Stephens | Costume Supervisor |
| Costume & Make-Up | Aaron Ramey | Costumer |
| Costume & Make-Up | Justin Curges | Costumer |
| Costume & Make-Up | Katherine Kalbacher | Costumer |
| Costume & Make-Up | Jeremy Bramer | Makeup Department Head |
| Costume & Make-Up | Melissa Eastwick | Key Makeup Artist |
| Costume & Make-Up | Lauren Citera | Hair Department Head |
| Costume & Make-Up | Aedel Park | Key Hair Stylist |
| Costume & Make-Up | Jacquelyn Taylor | Additional Hairstylist |
| Costume & Make-Up | Natalie Che | Additional Hairstylist |
| Costume & Make-Up | Mary Chipman | Additional Hairstylist |
| Production | Sara Furey | Location Manager |
| Production | Suzanne Koneful | Location Manager |
| Production | John Galloway | Location Manager |
| Production | Corey Asraf | Location Assistant |
| Production | Ryan Warner | Location Assistant |
| Production | Sean Martinez | Location Assistant |
| Production | Rachel Armiger | Production Coordinator |
| Production | Skyler Tapley | Assistant Production Coordinator |
| Production | Sunny Crist | Production Accountant |
| Production | Sylvia Fay | Extras Casting |
| Production | Christine Nelson | Casting Associate |
| Directing | Anthony Melino | Second Second Assistant Director |
| Directing | Courtney Fusselman | Additional Second Assistant Director |
| Production | Sydney Stewart | Key Set Production Assistant |
| Production | Zulu Aljaeri | Production Assistant |
| Production | Tyler Foltz | Production Assistant |
| Production | Patrick McNally | Production Assistant |
| Production | Linskey Sylvester | Production Assistant |
| Production | Guillermo Barreira | Production Assistant |
| Production | Timothy P. Smith | Production Assistant |
| Crew | Carly Rutizer | Actor's Assistant |
| Crew | Richie Christie | Transportation Captain |
| Production | Chad Russo | Attorney |
| Crew | Syimphfinni Armamourne | Set Production Assistant |
| Crew | Stephane Pain | Set Production Assistant |
| Crew | Jeff Schultz | Set Production Assistant |
| Crew | Sara Nishumura | Set Production Assistant |
| Crew | Joshua Stearns | Assistant Chef |
| Crew | Pascal Besse | Assistant Chef |
| Crew | Jonas Lopez Martinez | Assistant Chef |
| Crew | Scott Barter | Set Medic |
| Editing | Thomas Mitchell | Assistant Editor |
| Crew | Justin Scutieri | Post Production Supervisor |
| Sound | Daniel Timmons | Supervising Sound Editor |
| Sound | Giuseppe Cappello | Sound Effects Editor |
| Sound | Jonah Scott | Music Editor |
| Sound | Ian Gaffney-Rosenfeld | Sound Re-Recording Mixer |
| Sound | Ray Quintana | Foley Editor |
| Sound | Ray Quintana | Foley Mixer |
| Sound | Brahm Patel | Foley Recordist |
| Sound | Josh Murphy | Foley Artist |
| Sound | Joshua Perkins | Foley Artist |
| Sound | Vincent Deng | Foley Artist |
| Sound | Patrick Christensen | ADR Mixer |
| Sound | Nikola Simikić | ADR Mixer |
| Sound | Sylvain Pierre | ADR Mixer |
| Sound | Adam Clairmont | ADR Recordist |
| Sound | Bryan Brundige | ADR Recordist |
| Sound | Benno Calmbach | ADR Mixer |
| Editing | Nat Jencks | Colorist |
| Editing | Ethan Leight | Digital Intermediate Producer |
| Editing | Gil Litver | Digital Intermediate Assistant |
| Visual Effects | Pete Sussi | Visual Effects Supervisor |
| Visual Effects | Stuart Racey | Visual Effects Producer |
| Visual Effects | Dan Pochtrager | Compositing Supervisor |
| Crew | Mark Foscolo | Compositor |
| Crew | Esteban Garces | Compositor |
| Crew | Krupali Parikh | Compositor |
| Visual Effects | Blake Goedde | Visual Effects |
| Sound | Jay Lifton | Musician |
| Sound | Lee Reitelman | Musician |
| Crew | Jonah Scott | Additional Music |
| Sound | Jonah Scott | Musician |
| Sound | Aaron Heick | Musician |
| Sound | Suzy Perelman | Musician |
| Sound | Yuko Naito-Gotay | Musician |
| Sound | David Fallo | Musician |
| Sound | Sarah Hewitt-Roth | Musician |
| Sound | Alan Stevens-Hewitt | Musician |
| Sound | Brian Griffin | Musician |
| Crew | Rosario Varela | Thanks |
| Crew | Lucas Solomon | Thanks |
| Crew | Jay Glazer | Thanks |
| Production | William O'Brien | Assistant Location Manager |
| Visual Effects | Jean-François Beaulieu | Compositing Lead |
| Directing | Amy Miller Gross | Director |
| Writing | Amy Miller Gross | Writer |
