Triptolemus.

Triptolemus (Τριπτόλεμος) (Triptólemos), also known as Buzyges (Βουζύγης) (Bouzýgēs) was involved in agriculture in Greek myths and legends.

Oceanus and Gaia (Γαῖα) (Gaîa), or Celeus (Κελεός) (Keleós) and Metanita (Μετάνειρα ) (Metáneira), or Polyhymnia were his parents. Orpheus (Ὀρφεύς), Demophon (Δημοφῶν) (Δημοφόων), and Callidice (Καλλιδίκη) (Kallidíkē) were brothers and sister of Triptolemus.

He met with Demeter (Δημήτηρ) (Dēmḗtēr) and Persephone (Περσεφόνη) (Persephónē).

Eleusis.

Eleusis (Ἐλευσῖνι) was the hero in Greek mythology. His parents were Hermes and Daeira (Δάειρα). 

Eleusis had several relatives: Semele, Cadmus, Aulis, and etc.

He had a consort named Cothonea, they had a son Tripotolemus (Τριπτόλεμος). Goddess Demeter visited Eleusis and Cothonea.