So, I'm planning to write up a sort of split continuity fan fiction (Where my canon character isn't the Hero of Cyrodiil, but a thief who rose to prominence as the new Grey Fox, sort of a character within the main story type of thing)

Anyway, was 433 the last year of the third era? I want to try and match my story as close to lore as possible and am unsure if the Crisis marked the end of 3E or not.

Yes, it was definitely the last year of the Third Era. I've even writing an in-universe book about it (Just search 433, Last Book of the Third Era) if you want to read it.

Your story seems nice as well? Any other plot points?

Well, yes and no. It's meant to follow canon character in his twilight years and his two heirs. Their mother died in childbirth at the birth of the youngest daughter, so it's basically been him. Speaking of which, what's the plausibility of half race beings? I wanted the children to be half Imperial (father) and half Altmer (mother). Would such a union be possible? If so, would the six of the child follow respective race features of the parent of the same six? (I don't recall many halfbreeds in the series aside from Umaril and the Grey Prince in the Imperial City arenas. I just wanted this to be more a normal relationship to it.

Sorry if it seems off the question, but I figure it's better to put all my questions I may have here versus new threads every time a new thought comes up.

I'm sure somebody will come along and give the source but pretty much the offspring are of whichever race the mother was (for you, Altmer) but also take on a few of the father's traits. So pretty much, they would be Altmer.

Ah, I thought if it was a daughter, it'd be mother's features and the son the fathers, so it's always the mother who tends to be the physically dominant characteristics? Good to know. I'll be sure to incorporate this accurately then. Thanks!