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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Singular possessive: secretary's Plural: secretaries Plural possessive: secretaries'
The plural is relatives. The plural possessive is relatives'.
The plural is lads. The plural possessive is lads'.
The plural form is echoes. The plural possessive is echoes'.
The plural form is suffixes. The plural possessive is suffixes'.