Well, that is indeed a tough question.
Let's list possibilities that could answer it:
1- TATARI could have found true love while wrecking havoc 40~50 years ago.
2- Nasu messed up
3- The wiki is wrong and Zepia really is her grand-grand-grand-grand-grand-grandfather.
4- High quality flash-frozen sperm.
Personally, I think it is 2 or 3. But it would be fun if it was 4 and maybe a could turn into a good plot if it was 1...
Can someone list other possibilities?
"Let Chaos consume your soul, and you won't be neither good nor evil, neither light nor darkness. You will be hollow, will be future, will be freedom." -Chaos Chaud
"You defeat him" -GARcher
"Drown in your ideals and die" -GARcher
"My spine hurts. My body is cold. My fingers are frozen. Yet, my brain burns with fire."- T. Shiki