The plural form of the noun heiress is heiresses.
The plural possessive form is heiresses'.
example: The heiresses' father gave close scrutiny to their suitors.
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Singular possessive: secretary's Plural: secretaries Plural possessive: secretaries'
The plural is lads. The plural possessive is lads'.
The plural is relatives. The plural possessive is relatives'.
The plural form is suffixes. The plural possessive is suffixes'.
The plural possessive of stepsister is stepsisters'.