The most common moral in grandma's stories was probably 'be kind'. In many of her tales, the characters who were kind-hearted ended up getting rewarded in some way, like finding true love or getting a fortune. For example, in the story of Cinderella, her kindness towards the animals led to them helping her go to the ball.
One common moral was 'honesty is the best policy'. There were stories where the characters who lied got into big trouble. In the story of the boy who cried wolf, his dishonesty made people stop believing him, and when there was a real wolf, no one came to help him.
Grandma's stories had magical creatures too. Fairies, for example, were common. They usually helped the good characters in the story. In some tales, they would grant wishes or protect the heroes from harm.
In many grandma short stories, a common moral is about kindness. For example, if a story is about a grandma helping a poor neighbor, it teaches that being kind to others, especially those in need, is important.
Another great type of story could be the ones where she overcame difficulties during hard times. Maybe there were stories of how she managed to get enough food for the family during a shortage, which would show her resourcefulness and strength.
Another moral could be about redemption. Rick Dalton is a fading star who has made mistakes in his career. But through his journey in the movie, he has the chance to reinvent himself, showing that it's never too late to turn things around and find new purpose and success.
Because they are full of wisdom. Grandma has lived a long life and has a lot of experiences. Her stories are like little gems of knowledge passed down through the generations.
There's not enough information given to determine exactly who the grandma is. She could be a character specific to the Homestarrunner universe, perhaps related to one of the main characters.
One memorable story was when my grandma was gardening. She saw a small gopher pop out of the ground. Instead of being scared, she started talking to it like it was a neighbor, saying 'Hello there, little fella! You better not eat all my carrots.' It was so funny how she treated it like a person.
Family love is a very common theme. Grandma is often shown as a figure full of love and care for her family members, especially the grandchildren. For example, in many stories, she cooks special meals for them or tells them bedtime stories.
Often, the common themes are about family values. Grandma might tell stories about how her family overcame difficulties in the past.
One moral could be that vanity and excessive greed are bad. Cruella's obsession with having a dalmatian - fur coat shows her greed and vanity, and it's clearly presented as wrong.