Co-sibling-in-law Definition

noun

(rare) One's spouse's sibling's spouse.

(in the plural) The relationship between people who marry siblings.
Wiktionary
(rare) One's sibling's spouse's sibling.
(in the plural) The relationship between people whose siblings marry each other.
Wiktionary

Other Word Forms of Co-sibling-in-law

Noun

Singular:
co-sibling-in-law
Plural:
co-siblings-in-law

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