At the marriage of Kadmos and Harmonia Iasion was lured by Demeter away from the others and later killed by Zeus.
Demeter was not married. Demeter had two consorts in Karmanor and Iasion.
Sons of Demeter: Plutus/ Eniatus (with Iasion) Philomelus/Bootes (with Iasion) Korybas (with Iasion) Areiôn, immortal horse (with Poseidon) Eubouleus (with Karmanor)
Demeter's children were Persephone (with Zeus) and Plutus (with Iasion).
Iasion
Yes, Demeter is mother of eight children. Persephone (with Zeus) Ploutos (with Iasion) Bootes/ Philomelus (with Iasion) Korybas (with Iasion) Eubouleus (with Karmanor) Khrysothemis (with Karmanor) Despoine (with Poseidon) Areion (with Poseidon) Artemis is also at times called a daughter of Demeter.
Zeus, Poseidon, Iasion and Karmanor.
Demeter's husbands have been Zeus, Poseidon, Iasion and Karmanor She was never officially married though. Sadly, only two of her children shared a father. Zeus was the father
Zeus, Poseidon, and Iasion/Karmanor
Demeter never claimed a husband, but had a consort in Iasion and Carmanor: she also mated with Zeus and Poseidon.
Ploutos (Wealth) is sometimes said to be the son of Tyche, but then so are Demeter and Iasion.
Ploutos (Wealth) is sometimes said to be the son of Tyche, but then so are Demeter and Iasion.
Demeter's children were Persephone, Despoina, Arion, Plutus, Philomelus, Eubuleus, Chrysothemis, and Amphitheus I. Her consorts were Iasion, Oceanus, Cronus, Zeus, and Triptolemus.