Your in-laws are the family you get through marriage, not through birth. People most often mean the father and mother of your husband or wife, but the word can cover brothers, sisters, and the wider family too. “The in-laws are coming this weekend” usually means those parents, and sometimes the whole visiting side.

Your你的 in-laws是 through marriage透過婚姻、not through birth而不是透過出生 the family you get得到的家人。People人們 most often mean最常指的是 of your husband or wife你先生或太太的 the father and mother父母，but但 the word這個詞 can cover也可以涵蓋 brothers, sisters兄弟姊妹，and the wider family too甚至更大範圍的家人。“The in-laws are coming this weekend”「公婆／岳父母這週末要來」usually means通常指 those parents那對父母，and sometimes有時是 the whole visiting side來訪的整個那一邊。

It is everyday English, a little informal, and almost always plural when you mean the group. For one person you say mother-in-law, father-in-law, sister-in-law, and so on.

It它是 everyday English日常英語，a little informal有一點不正式，and而且 when you mean the group當你指整群人時 almost always plural幾乎都用複數。For one person指單獨一個人時，you say你會說 mother-in-law婆婆或岳母、father-in-law公公或岳父、sister-in-law嫂嫂或小姑，and so on等等。

Though actually the “law” here is the old idea of being related by the law of marriage, not by blood — that is why they are “in-laws” and not “in-bloods.” Some families use it warmly; some use it with a small sigh.

Though actually不過其實，here這裡的 the “law”「law」，is是 by the law of marriage因婚姻之法、not by blood而非因血緣 being related而成為親人 the old idea的老觀念——that is why所以 they are他們才叫 “in-laws” and not而不是 “in-bloods.” Some families有些家庭 warmly溫暖地 use it用這個詞；some有些 with a small sigh則帶著一聲小小的嘆息 use it用它。