[quote=@Cyclone]
I mean how did Ares and Hephaestus come from the god of the sky and the goddess of the hearth? There are plenty of examples of gods that are nothing like their parents.
[/quote]

Also, because I'm a nitpicker about Greek and Roman anything, I must point out that Ares and Hephaestus are children of Zeus and HERA (the Goddess of Family and Marriage).

The Goddess of the Hearth is Hestia, not Hera. Ares and Hephaestus were never children of the Goddess of the Hearth.
Fun Fact: The Goddess of the Hearth was a virgin