Brie Larson (The Spectacular Now) is attached to star now in the film, which writers including Andrew Lanham, Marti Noxon (I Am Number Four) and Cretton himself have scripted based on Jeannette Walls' memoir. Her parents, Rex and Rose Mary Walls, were free spirits who lead a nomadic existence. Her mother was more concerned with painting and writing than, say, making dinner for her four kids, while her father could be inspiring and educational, but only when sober. The parents crumbled as their money ran low, and Jeanette and her siblings ended up more or less raising themselves.
Harrelson has spent plenty of time playing alcoholic characters you root for – Hunger Games' Haymitch among them – so he knows how to deliver on a role like this. The Glass Castle will likely have to wait until Larson has finished exploring dangerous territory in Kong: Skull Island, so we would expect Cretton to roll his cameras next year. And, as if you didn't already know, Harrelson is currently back on our screens in Francis Lawrence's The Hunger Games: Mockingjay – Part 2.