SERIESMOVIESNEW & LAST CHANCESCHEDULEFREE EPISODESMoreDocumentariesSpecialsSportsPodcastsHBO MAXSIGN INGET HBOMAXSERIESMOVIESNEW & LAST CHANCESCHEDULEFREE EPISODESMoreDocumentariesSpecialsSportsPodcastsHBO MAXSIGN INGET HBOMAXSIGN INStream all of HBO plus more TV, movies, and Max Originals at no additional cost.SIGN INHBO Max The Righteous Gemstones About Season Season 1Season 2Kelvin Gemstone Played by Adam Devine As Jesse’s younger brother, Kelvin has a lot to prove if he’s going to be taken seriously as a minister and person. Small and fierce, he may be more innocent than his siblings, but he’s just as fiery.