Demeter and Zeus have a daughter and she is one of the fairest, named Persephone.
Hades sees young Persephone on Earth and wants to take her because she is so beautiful.
Hades ask Zeus for Persephone's hand in marriage and Zeus says yes,
Hades steals Persephone while she is on Earth and brings her to the Underworld for she is now his wife and queen.
Demeter has been searching everywhere on Earth for her daughter Persephone and she starts to cry after she doesn't find her after searching the whole Earth.
Demeter finally decides to go to Zeus and ask where her daughter is and Zeus explains Hades took her hand in marriage and she's in the Underworld. Demeter wants Persephone back but Zeus refuses to give her back.