Odin was the chief god in the Norse mythology, and the father of Thor, Balder, Hoder, Tyr, Bragi, Heimdall, Ull, Vidar, Hermod and Vali. His wives were Fjorgyn, Frigga and Rind. He had a bad habit to roam around Midgard in human disguise seducing and impregnating women. This is why many mortals were able to trace their ancestry back to him.
Thor was the son of Odin and Fjorgyn. He was the god of thunder, the sky, fertility and the law. Armed with his strength-giving items, a belt and the hammer Mjölnir, he had a simple way of righting wrongs: he more or less killed everything that moved. The other gods -mostly Loki- occasionally took advantage of Thor's simplicity.
See more Viking Gods at http://www.rosala-viking-centre.com/gods.htm