Look it up...

...on the Internet!

Author Stephen Brust posts the following in his blog:

"Does anyone remember the given name of Vlad's father? I think I do, but I'm too lazy to look it up, and it would be so embarassing to be wrong."

--One the commenters responds:

"Maybe Sethra Lavode is his father too...Vlad, I am your father...come to the dark side of necromancy."