How often do the different Races inter-mingle with each other?

[Antonio_Xul]

Though we're never told how many couples between those two were so the numbers might've been low and like how you get either a boy or a girl there's a 50% chance if could be a Human or not. Well seeing as FFXIV Lore mentions the child will always be the same as the mother.

I've always wondered why they never added half-breed or interracial races in game as this would obviously occur with so many different combination of love interests, but now that I read that the mother's race takes preference, it all makes sense now. Where can I read upon that?