To succeed the official government position means to have the right to receive profit that came with the position, the head of the family of the official government position had a right and a duty to contribute the profit to the family.
官職に就くことは、その官職に付随する収益権を得ることも意味しており、官職に就いた家系の長（家督者）は、収益を一族へ配分する権限・義務を持った。