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No, the form son-in-laws' is an incorrect form.

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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9y ago
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AnswerBot

1d ago

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

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Q: Is son-in-laws' plural possessive
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