One possible moral could be about acceptance and communication within a family. The son, being gay, may be teaching his dad something important like acceptance of different identities while in such an intimate setting as the shower, which could symbolize a place of vulnerability and openness.
The story of 'Cinderella' teaches us that kindness and perseverance can lead to a better life. Despite facing hardships, Cinderella's good nature eventually brings her happiness. Also, it shows that good things can come to those who wait and keep believing.
Such a short story is often called a 'moral story'. These stories aim to impart valuable life lessons or wisdom through fictional characters and events.
It's typically referred to as a 'morality tale'. These tales aim to instruct and guide people's behavior by presenting moral principles through engaging narratives. One well-known morality tale is 'The Emperor's New Clothes', which warns against vanity and pride.
A story that teaches a moral lesson is often called a 'fable'. Fables usually feature animals or fictional characters to convey important values and lessons.