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