As played in the film by French actress Élodie Yung, Hathor is the consort of Osiris, and later Set, and appears to be the mother of Horus. The actual relationships between the gods is ambiguous, actually, and that mirrors legend as well.
Eygptian mythology is far from monolithic, and details on specific deities often vary between regions, eras and dedicated cults. For instance, Isis is usually identified as the mother of Horus, but it some writings Hathor takes her place.
The goddess of fertility and love, Hathor was among the most popular deities with the common people in ancient Egypt. She was the goddess that women prayed to during childbirth. Hathor is associated with the goddess Aphrodite in Greek mythology, and Venus in Roman mythology.
In paintings, sculptures and other Egyptian iconography, Hathor is identified with the cow and often depicted with cow-like ears or other attributes. Both men and women could be priests of Hathor.
A sculpture of the Egyptian goddess Hathor in her manifestation as cow goddess, from the Museum of Egyptian Antiquities in Cairo.
Ancient Egyptian Mummy Wearing Jewels Found