Rob and Nick Reiner were constantly "butting heads" on the set of their film Being Charlie! The 2015 film, which was written by Nick and directed by Rob, was very much inspired by the screenwriter's own history with drug addiction and homelessness, beginning when he was a teenager. (c) FayesVision/MEGA/WENN & Michele Singer Reiner/Instagram The father and son have claimed the experience of making the movie brought them "closer" than ever before.