A short summary of "The Story of the Aged Mother" is: 
A degree was given by a wicked ruler to put to death all old people. A poor farmer took his aged mother up a mountain to obey the degree, but could not. He brought his mother down the mountain and hid her. The wicked ruler demanded that a twisted straw rope be made. It was the aged mother who told how to make the rope. The son told the governor the story and the degree was abolished.