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The plural form of the compound noun son-in-law is sons-in-law.

The plural possessive form is sons-in-law's.

example: Both of my sons-in-law's birthdays are on the same day.

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7y ago
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7mo ago

The plural possessive of son-in-law is sons-in-law's.

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Q: What is the plural possessive of son-in-law?
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