I agree with you on that.... Okay I'm pretty sure Vergil was not a ten year old father.
True indeed about Sparda I mean. But Vergil being a 10 year old father? I'm sorry but I just can't see it happening.If he was a ten year old father, he has to be the most bad ass of all the guys in DMC, lol.
Sparda was on earth a while BEFORE marrying Dante and Vergil's mother. So it isn't unlikely that he had a lover before then and his blood passed down through the generations.