Unveil: Jadewind Episode 22

九族, jiǔzú

I had misunderstood this as nine generations of the criminal's family would also be killed, which didn't make much sense. I found out it encompasses not only their lineal ascendants and descendants of the criminal but also their spouse & spouse's parents. Plus, their siblings, siblings-in-law, aunts & uncles, cousins (up to third cousins). Then, it becomes clear where the nine kinships come from.