A young girl imagines herself as the "Mummy," taking care of her father, William. She ensures he wakes up early, gets plenty of exercise, and even supervises him during a supermarket trip. The twist comes when it's revealed that William is actually the father, and the girl is playfully taking on the role of the caregiver. This role-reversal narrative offers a humorous and affectionate look at family dynamics and the loving bond between parent and child.