He's the son of Khnum and Neith, and brother to Thoth. Also among his siblings are Sobek, god of the Nile and the military; Serket, goddess of scorpions and medicine/healing; and Apep, god of darkness.
Consorts & Children:
He's the father of Bastet, Hathor, Ma'at, Sekhmet, Shu, and Tefnut.
He's sometimes combined with sun-gods Amon, Atum, or Horus. He's usually depicted as a man with the head of a hawk or a falcon, with a sun disk and uraeus (an upright cobra that symbolizes royalty and divine authority) on his head.
Notable Stories Involving Him:
Humans are said to be created from his sweat and tears, while the pharaohs, referred to as Sons of Ra, were said to be manifestations of Ra on Earth. Upon learning that mankind was plotting against him, he sent Hathor-as-Sekhmet to punish them, but when she became too bloodthirsty and nearly destroyed humanity in the process, he pacified her with beer colored to look like blood. As god of the sun, he's said to possess a boat upon which he journeys across the sky each day and through the underworld each night.
SOURCES: Wikipedia and Encyclopedia Mythica