The Black Mustard Seed
Writing about web page http://online.sfsu.edu/~rone/Buddhism/footsteps.htm
Once there was a woman named Kisagotami, whose first-born son died. She was so stricken with grief that she roamed the streets carrying the dead body and asking for help to bring her son back to life. A kind and wise man took her to the Buddha.
The Buddha told her, "Fetch me a handful of mustard seeds and I will bring your child back to life." Joyfully Kisagotami started off to get them. Then the Buddha added, "But the seeds must come from a family that has not known death."
Kisagotami went from door to door in the whole village asking for the mustard seeds, but everyone said, "Oh, there have been many deaths here", "I lost my father", I lost my sister". She could not find a single household that had not been visited by death. Finally Kisagotami returned to the Buddha and said, "There is death in every family. Everyone dies. Now I understand your teaching."
The Buddha said, "No one can escape death and unhappiness. If people expect only happiness in life, they will be disappointed."