Atypical is a coming of age story that follows Sam (played by Keir Gilchrist), an 18-year-old on the autistic spectrum as he searches for love and independence. While Sam is on his funny yet emotional journey of self-discovery, the rest of his family must grapple with change in their own lives as they all struggle with the central theme: what does it really mean to be normal? Jennifer Jason Leigh stars as his mother, Elsa, who is on her own journey of self-discovery.   Michael Rapaport plays his father, Doug. Brigette Lundy-Paine (Margot vs Lily, The Glass Castle) plays Sam’s sister Casey and Amy Okuda (How to Get Away with Murder)…