The possessive form of the plural noun colonists is colonists'.
Example: These are examples of the earliest colonists' dwellings.
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The plural possessive form of "colonists" is "colonists'."
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'.