Because Persephone was Demeter's only daughter
Persephone
Hades kidnapped Demeters daughter persephone
Initially Persephone didn't have a father but later they attributed it to Zeus.
Hades caused famine on Earth when he abducted Persephone into the Underworld.
Her mom and dad are Cronos and Rhea, her grandparents are Gaea and Uranus, she also has a daughter named Persephone. Her sisters are Hera and Hestia, and her brothers are Zeus, Poseidon, and Hades.
Demeter's parents are Rhea and Cronos. Her siblings are... Poseidon, Zeus,Hades, Hera, and Hermes. Her daughter is Persephone
Hes the god of Hell he played an important part in Mythology, like when he kidnapped Demeters daughter Persephone.
Zeus, Hera, Poseiden, Hades, and Hestia--Siblings Persephone/Kore--daughter (by Zeus) Cronus and Rhea--parents
Zues, Posiedon, and Persephone,
Zeus and Demeter had only one child, a daughter called Kore named Persephone after marrying Hades.
Hades, Lord and God of the underworld was the one who kidnapped Demeter's daughter, Persephone. He took her down to the underworld to be his wife and queen of the underworld.
Demeter's Weaknesses: Not one to cross lightly. After the kidnapping of her daughter Persephone, Demeter blights the earth and won't let the plants grow.