There are no special provisions regarding the Emperor's maternal consanguinity or relatives by marriage (a provision existed in the aforementioned Ordinance of the Family of the Imperial Household, but was abolished in 1947), and the Civil Codes stipulate that among the Emperor's in-laws, those within the third degree of relationship from the Empress are considered the Emperor's relatives by marriage.
天皇の母方の血族や姻族に関しては特別の規定がなく（上述の皇室親族令には規定があったが昭和22年に廃止）、民法の規定により、天皇の外戚の内、皇后から3親等内の者が天皇の姻族となる。