My daughter-in-law comes for dinner every Sunday.

daughter-in-law 是由 daughter（女儿）和 in-law（法律上的）组成的复合词，字面意思是"法律上的女儿"。 in-law 是固定搭配，表示"因婚姻关系而成为的亲属"。 daughter-in-law 指"儿子的妻子"，即"儿媳"。