You probably wanted a REAL answer, but I don’t want to spoil ya. Hit the jump for spoilation.

(For headcanons and to talk to a Viktor RPer, go to @viktor-de-lioncourt​ (who uses Jordan Sörbom as a FC) or @roselioncourt​, both of whom care quite a lot more than I do about this character.)

Viktor is Lestat’s biological son, created during the course of Prince Lestat. In the mid-90s (I think?) Lestat had encountered some vampire doctor/scientists (they are vampires trained in and interested in the study of vampirism, running a lab just for that) and they *ahem* collect a biological sample from Lestat, with his full compliance.

HOWEVER, without his consent or knowledge, they use his sample to make baby Viktor! Baby Viktor has a mortal mother, so presumably, the DNA needed a little tinkering to make it work; Viktor is considered partially a clone, and in appearance he seems to be a carbon copy of Lestat (slightly taller, IIRC).

Lestat doesn’t know he fathered him until Viktor is no longer a baby (he’s at least 20?) and is used as a pawn in the shaking up of the vampiric matriarchy, so to speak. Father and son get reunited, everybody’s happy.

It’s unclear whether Lestat is also Viktor’s vampiric maker, he had asked Marius to be involved, and we might get more specifics in the next VC, Blood Paradise. 

Louis is always Lestat’s fave, tho! We all know that.