It means either your spouse's relatives or people who married your relatives.
So:
father in-law - your husband's/wife's father
sister in-law - your husband's/wife's sister OR your brother's/sister's wife (and I've heard people use it for their spouse's sibling's wife - though that's not technically correct).
People will also refer to their spouse's relatives as "my in-laws."
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It means that they became your relatives by marriage. Father in law, he bacame a relative because you marryied his.
Sister in law, she became my sister because I married her sister.
September 5, 2018
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Father in law is the father of your husband.
Sister in law is the sister of your husband.
you are a sister in law for the wife of your brother, and so on ...
September 5, 2018
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father in law means husband father
sister in law means sister of your husband, I think that ..
September 5, 2018
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