Casey Affleck explores parenting in the apocalypse

Casey Affleck had been working on a script about a parent and child for years. He'd written scenes about a bedtime story and an argument about taking a trip into town and things seemed to be going well. As the father of two boys, Affleck had defaulted to writing the child as a son. But then, deep into the process, his boys came back with a request: they didn't want it to be about them.