There is no requirement for any but the King. All family are expendable & can be replaced by hire. Hire they all are in any case.
Death of 666
There are 110 family for each of the 6 who need to die, 111 including them, times 6 making 666. The replacement for each is of crucial importance. The holier the replacement the cleaner & more just the World Government.
If 111 priests were nearby when 111 of an Archangel heirarchy was shot dead the Archangel of each would enter into them & evict the Angels already there by seniority. That is a clinical replacement with a perfect Government.
My own family are filthy & unworthy of Government, although not a part of the 666. Only the modern way.