Zombie Film With Grandpas & Grandmas

The director wants to use drama to revitalize his grandmother's memory. He has the whimsical idea of mobilizing the neighborhood to shoot a Grade B movie with his grandmother featuring Power Rangers fighting zombies. However, they encounter difficulties finding actors, and in the early stages of filming, the grandmother accidentally injures her hand. With the grandmother already losing short-term memory, how will the director, his family, and the neighbors in the community complete this filming?