Text: By marrying his daughters to sons of the reigning emperor and then engineering timely abdications, a Fujiwara contrived always to be father-in-law, uncle, or grandfather behind the throne.
Entailment: The Fujiwaras always stayed in power  because they carefully constructed familial marriages and arrangements as to forever have male family at the throne.
Contradiction: Fujiwaras failed to stay at the forefront of the empire when an unrelated male married his way to the top.