...

To be honest, I'm surprised they aren't married in mythological canon, knowing the Olympian family tree.

Or, maybe, my thinking is just affected by Baltic mythology. The Sun and the Moon are often portrayed as married in my culture (the genders are the opposite, by the way - the Sun is female, the Moon is male). Or divorced. In that one song, the Moon does cheat on the Sun with the Evening Star, and gets hacked in half with a sword during the divorce.