Over the last two years, Ryan and Amy Green have been developing a video game titled “That Dragon, Cancer,” which centers on their son Joel’s battle with the illness. Filmmakers David Osit and Malika Zouhali-Worrall document the family’s journey as they work on the game and navigate the daily challenges of Joel’s medical care, crafting a poignant tribute to the emotional highs and lows of parenting a child with a terminal condition.