<P> Later during the party, Ned and Scotty approach Laird for a new business idea, since they are all part of the same company now . Scotty says they should sell the same toilets Laird has in his home since they would be very profitable . Laird likes the idea and agrees . The couples then dance together as music plays, with Ned referring to Laird as "son". </P> <P> At the end credits scene, Scotty, Ned, and Laird turned the printing company into a toilet factory and became a huge success . Stephanie linked the Fleming - Mayhew company with the new foundation and helped third - world countries with their sewage projects . Finally, Laird got what he always wanted, to be part of a family . </P> <Ul> <Li> James Franco as Laird Mayhew, an eccentric, foul - mouthed CEO of a video game company and Stephanie's older boyfriend </Li> <Li> Bryan Cranston as Ned Fleming, Stephanie's conservative father and Barb's husband </Li> <Li> Zoey Deutch as Stephanie Fleming, Laird's girlfriend, Ned and Barb's daughter, and Scotty's older sister </Li> <Li> Megan Mullally as Barb Fleming, Ned's wife and Stephanie's mother </Li> <Li> Cedric the Entertainer as Lou Dunne, Ned's best friend and business partner </Li> <Li> Griffin Gluck as Scotty Fleming, Stephanie's 15 - year old younger brother and Ned and Barb's son </Li> <Li> Keegan - Michael Key as Gustav, Laird's best friend, butler, calmer assistant and trainer, the billionaire's European - hailing estate manager </Li> <Li> Kaley Cuoco as the voice of Justine, Laird's in - home artificial intelligence </Li> <Li> Zack Pearlman as Kevin Dingle, Ned's I.T. guy </Li> <Li> Jee Young Han as Marnie Dingle, Kevin's wife </Li> <Li> Jacob Kemp as Randy the Intern </Li> <Li> Grace Ly Ngo Hazelett and Sadie Kate Ngo Hazelett as Vanessa Dingle, Kevin's daughter </Li> <Li> Casey Wilson as Missy Pederman, the first creator of an online invitation company called StampFree Invites . </Li> <Li> Andrew Rannells as Blaine Pederman, the second creator of an online invitation company called StampFree Invites . </Li> <Li> Adam DeVine as Tyson Modell, the creator of the wildly popular Ghostchat app . </Li> <Li> Tangie Ambrose as Patty Dunne, Lou's wife and Barb's friend </Li> <Li> Steve Bannos as Tree Lot Owner Burt </Li> </Ul> <Li> James Franco as Laird Mayhew, an eccentric, foul - mouthed CEO of a video game company and Stephanie's older boyfriend </Li>

Who does the voice of justine in why him