mortal people
No, but she had many affairs.
Medusa and Demeter He married Amphitrite.
Demeter wasn't really married to anyone, although she did have one or two children, though they were conceived through affairs. She was said to have had affairs with either Zeus or Poseidon.
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)
There was no "god of Demeter", Demeter was a Greek goddess.
Demeter
Demeter was not married. Demeter had two consorts in Karmanor and Iasion.
Demeter was older. Demeter was born of Cronus and Rhea. Her brothers were Zeus, Hades, and Poseidon. Since Artemis is a daughter of Zeus, Demeter's youngest sibling, Demeter has to be older. This also makes Artemis Demeter's niece.
Demeter is a girl. Demeter was a Greek goddess of agriculture.
demeter
No. Demeter is a Greek name. The Roman name for Demeter is Ceres.
Demeter the meter! come see Demeter heaters!