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Honestly, Elder Scrolls has it right: the offspring of two different races will always be the race of the mother, but with some traits of the father.
None of that funny crossbreeding stuff, just keep it simple.
So basically your mitochondria decides your species?
Personally I like keeping it a little more complicated. It’s the same race as the mother, unless the mother is a ditto, in which case it’s the same race as the father.