What is morpheus's relationship to other gods and goddesses?

In Greek mythology, Morpheus is a god of dreams, son of Hypnos (god of sleep) and Pasithea (goddess of relaxation). Morpheus is often associated with other gods and goddesses related to sleep and dreams, such as Hypnos and his brothers Phobetor (creator of nightmares) and Phantasos (creator of surreal dreams).