O’Shea Jackson Jr., 24, is receiving rave reviews for playing Ice Cube in the hit N.W.A. biopic “Straight Outta Compton.” You could say he was born to play the role, as he’s the real-life son of N.W.A. member, Ice Cube, whose real name is O’Shea Jackson. But the part wasn’t handed to him. To earn the role, Jackson went through a grueling two-year process that included constant auditions and working with three different acting coaches. “It’s all these things to build confidence within me,” Jackson told Entertainment Weekly about the process. And though Cube was supportive of this son’s growth, as a...