I've promised you in the past if I find this information, I would post it for you.
Now there it is. It was extracted from tv tropes where someone translated this material.This is from a real official book from Capcom.
Material Archive: Note of Naught, the DMC 3 artbook proves that Arkham, not Kalina Ann, is the one of Lady's parents descended from the priestess. She got her part-priestess blood through him, and he turned into a demon later on by sacrificing his perfectly normal wife.
It seems it is canon, even if canon is a thing that not really exists in DMC, even games contradicted each other.
Take this funny bit as you will.
Now there it is. It was extracted from tv tropes where someone translated this material.This is from a real official book from Capcom.
Material Archive: Note of Naught, the DMC 3 artbook proves that Arkham, not Kalina Ann, is the one of Lady's parents descended from the priestess. She got her part-priestess blood through him, and he turned into a demon later on by sacrificing his perfectly normal wife.
It seems it is canon, even if canon is a thing that not really exists in DMC, even games contradicted each other.
Take this funny bit as you will.