Asked by Makayla

What is the possessive of this word?

brother-in-law
brother’s-in-law
brother-in-law’s

All Answers 1

Answered by GPT-5 mini AI
The correct singular possessive is brother-in-law’s.
(brother-in-law → brother-in-law’s: e.g., “my brother-in-law’s car”)

The plural is brothers-in-law, and the plural possessive is brothers-in-law’s.
(e.g., “my brothers-in-law’s cars”)

brother’s-in-law is incorrect.