sibling-in-law

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Noun

sibling-in-law

1. A relative of one's generation, separated by one degree of marriage:
   1. The sibling of one's spouse.
   2. The spouse of one's sibling.
2. (uncommon) Co-sibling-in-law: A relative of one's generation, separated by two degrees of marriage:
   1. The spouse of the sibling of one's spouse.
   2. The sibling of the spouse of one's sibling.

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