民法では、三親等内の姻族も親族に含まれる。
Under the Civil Code, in-laws within the third degree of kinship are also counted as relatives.
配偶者の死後、姻族関係終了届を提出する人が増えている。
More and more people are filing notices to end their in-law relationship after a spouse's death.
妻の兄は私にとって二親等の姻族にあたる。
My wife's older brother is a second-degree relative of mine by marriage.