Basara is MY FAVORITE MANGA EVER!!! I am always saddened to meet someone who doesn't or won't read it.

"Okay, I had to read this line a couple of times because it was so unexpected. How does one have the ultimate personification of evil as a family heirloom?"

basically, it's passed on genetically from father to son, and when your son is born, it leaves you and you die. Jackie is about the only one to find out about it before the "dying young" part(not that the family really has much life expectancy anyway...)