Adam Sandler as Howard Ratner, a Jewish-American Diamond District jeweler who is addicted to gambling Julia Fox as Julia, Howard's employee and girlfriend Idina Menzel as Dinah Ratner, Howard's wife Lakeith Stanfield as Demany, Howard's assistant, who recruits clients Kevin Garnett as himself, a power forward for the Boston Celtics Eric Bogosian as Arno, Howard's brother in law and a loan shark Keith Williams Richards as Phil, Arno's quick-tempered henchman Judd Hirsch as Gooey, Howard's father-in-law Mike Francesa as Gary, Howard's bookie Noa Fisher as Marcel Ratner, Howard’s daughter Jonathan Aranbayev as Eddie Ratner, Howard's older son Jacob Igielski as Beni Ratner, Howard's younger son Wayne Diamond as Wayne, a wealthy gambler who takes a liking to Julia Josh Ostrovsky as Noah Benjy Kleiner as Aaron Pom Klementieff as Lexus Tommy Kominik as Nico Keren Shemel as Elline Goldfarb Sahar Bibiyan as Ida Lana Levitin as Ruth