Correct the possessive nouns.

The sisters-in-law potluck was a sucess.
(plural)

Carlos dog ran home.
(singular)

sisters-in-law's potluck

Carlo's

thank you , so for

My brother scout had a fair.
(singular)
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brother's?

Mrs. Sue ??

Your last sentence doesn't make any sense. Did you omit a word?

oh sorry, let me check..

Ahhh, i am soo sorryy yess!!

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My brother scout group had a fair.
(singular)

brother's