Ra
Ra was alone in the mists of Nun and so he made himself pregnant. He then gave birth to air, Shu, and moisture, Tefnut, by spitting them out of his mouth.
Air and moisture mated to produce the earth god Geb and the sky goddess Nut.
Geb and Nut mated and produced Osiris, Isis, Set and Nephythys.
Ra is the sun god and has many aspects. These often relate to the position of the sun in the sky.
Men were said to have been created from Ra's tears but he found them distasteful and ordered Hathor to destroy them. Hathor went about her task so efficiently and enthusiastically that Ra asked her to stop. she would not stop her slaughter however until Ra tricked her into getting drunk.
Adapted from 'A guide to the Gods' by Richard Carlyon