Simple English definitions for legal terms
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A sister-in-law is someone who is related to you through marriage. She can be the sister of your spouse or the wife of your brother. Sometimes, the wife of your spouse's brother is also considered a sister-in-law.
Definition: Sister-in-law refers to the sister of one's spouse or the wife of one's brother. It can also refer to the wife of one's spouse's brother. The plural form of sister-in-law is sisters-in-law.
These examples illustrate how sister-in-law can refer to either the sister of one's spouse or the wife of one's brother. In the first example, the speaker's husband has a sister who becomes the speaker's sister-in-law. In the second example, the speaker's brother has a wife who also becomes the speaker's sister-in-law. The third example shows how gaining a sister-in-law can happen when a sibling gets married.