There is no child of Zeus born in the mythology of Greece in the modern age.
Zeus promised Athena that she didn't have to get married since Athena was his favorite daughter.
The goddess Hera. She was Zeus' wife and since Zeus had an affair with Alcmene, she vowed to kill the child of them (Hercules)
Ares was the child of Zeus and Hera.
Persephone has a lot of half siblings. Since her father is Zeus, any child of Zeus' would be her half-sibling.
Hephaestus is the son of Zeus; or if the child of Hera alone, Zeus is his uncle.
Perseus was a child of Zeus and the human woman Dinae.
the worst child of zeus and hera is ares
Athena was Zeus' favorite child because Zeus let Athena use his aegis and thunderbolt.
Athena was a child by METIS and Zeus. not thetis.
Since his father was Zeus, he has many siblings. Any child of Zeus was a sibling to Hephaestus.
Zeus was the child of Cronus and Rhea