a possessive construction consisting of a prepositional phrase with of containing a substantive in the possessive case, as of father's in He is a friend of father's.
- Also called double genitive.
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How to use double possessive in a sentence
A peculiar form, a double possessive, has grown up and become a fixed idiom in modern English.An English Grammar | W. M. Baskervill and J. W. Sewell
Both of these are now used side by side; sometimes they are used together, as one modifier, making a double possessive.An English Grammar | W. M. Baskervill and J. W. Sewell