《旧唐书·本纪·卷四》
文武官员九品以上及五品以下儿子为父亲继承人者，赐予勋官升一等。
文武九品已上及五品己下子为父后者，赐勋官一转。
The sons of fifth grade and above civil and military officials, and those of ninth grade or below, granted the right of succession will receive a medal move up one rank