What is the structure of the story of aged mother?

"The Story of the Aged Mother" is a Japanese folktale that follows a mother and her son as they navigate a tyrannical law mandating the killing of the elderly. The son defies the law and escapes with his mother to the mountains, where they learn valuable lessons about love, sacrifice, and the wisdom of age. The story culminates in a poignant conclusion where the mother sacrifices herself to save her son and the villagers.