No. Demeter is the daughter of Kronos and Rhea. She and Zeus are siblings.
Zeus is the brother of Demeter
Demeter is Zeus' older sister
No, Zeus and Hestia never had a child. Hestia was the virgin sister of Zeus. Zeus had children by both his other sisters, Demeter and Hera - only Hera he married.
Demeter had one child with Zeus, a daughter named Persephone.
Persephone's parents are Zeus and Demeter.
Demeter and Zeus did not marry, but did have the child Persephone/Kore.
Zeus and Demeter were not lovers. Demeter bore a daughter by Zeus named Persephone (Kore), however Zeus married his other sister, Hera. (Note that Zeus mated with many other goddesses and mortals, not just his lover and Demeter)
Yes, Demeter and Zeus were lovers. They produced a daughter Persephone.
Demeter's childhood was short lived. When she was a kid she was swallowed by her dad, Kronos. When Zeus poisoned Kronos and she came back up she was a fully grown woman.
Demeter and Hestia were her sisters. She also had three brothers Zeus, Poseidon, and Hades.
There was only one child between Zeus and Demeter, and that was Persephone.
Zeus is the brother of Demeter.