Mike is a 17 years old year teenager who is growing a moustach. His mother doesn`t like it that much.
I forgive you, Meg
Mike is going to visit his grandmother and was warn by his mother that there are chances that his grandmother might not remember him.
He was glad when his grandmother called out his name. But it turned out that she has mistaken him as her deceased husband who also named Mike. And then she starts to bring up the past then she asks forgiveness for her wrongdoing.
Mike wanted to tell her that he is her grandson but after a bit of thinking, he decided to play along and told his grandmother ( as her husband ) that he forgives her.
After he arrives back home, he decides to shave off his mustache.