Co-sibling-in-law

Full definition of co-sibling-in-law

Noun

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

Coordinate terms

• co-brother-in-law
• co-sister-in-law

Related terms

• co-in-law
• co-parents-in-law