User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-5247339-20130703090010/@comment-3146930-20130705182124

I think...honestly I only understood about half of your post, maybe less. The "giant that does the people skulls worship thing" is Antaeus, who is in fact a child of Gaea and Poseidon. There are even a few stories about Zeus having children with Gaea. As far as family bonds go, the gods really don't care that much. I mean Arion is a child of Demeter and Poseidon (brother and sister); Persephone is some myths is a child of Zeus and Demeter, meaning Hades is married to his niece and his sister is his mother in law. In the series, they explain this as gods not having DNA. Even their demigod children say you can date anyone you want who doesn't have the same parent, but this is most likely just because of the Gross Factor.

As far as Hephaestus being married to a grace, he was said to be married to Aglaia in the Iliad, but most of the time he is said to be married to Aphrodite...who cheats on him...a lot. It really depends on which myth you read.