Been years since I watched this, wondering if you recall any specifics about the turning process in this universe.
Was it simply being bitten / drained-to-death by a vamp or did you need to drink their blood? I only seem to remember victims being bitten/buried/rising but maybe there was some small mention of counter-feeding.
No, I can't remember any percentage or anything. But I'm pretty sure they said that if both parents died without rising, there's no chance their child could. Nao could transform, her husband couldn't and her child couldn't either.