Definitions for double possessive
Random House Webster's College Dictionary
a possessive construction consisting of a prepositional phrase with of containing a substantive in the possessive case, as of father's in She is a friend of father's.
Ref: Also called double genitive.
Two or more consecutive nouns in the possessive case, as with "St. Paul's Cathedral's vergers"; discouraged on grounds of style.
Combination of the periphrastic possessive, "of x" with the possessive inflection of a noun. For example, "A friend of John's".
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