The "a dear friend of Manet's" construction is called a double possessive
, which has two requirements: when the word after "of" is an animate object (at the time, Manet was animate); and the word before "of" refers to only a portion of the animate object's possessions.
Second, one child used both 's and a preposition for in a double possessive
'what's the brother's name for Jaimey?' 'what's Jaimey's brother's name?' [Ross; 2;11.00].
Benetto Michael Imperioli Posey Benetto Ellen Burstyn Len Benetto Scott Cohen Young Posey Samantha Mathis Young Chick Vadim Imperioli Rose Alice Drummond Maria Emily Wickersham Executing a rare double possessive
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Levy, who is marketing communications manager for the Water Environment Federation in Alexandria, Va., writes, "Is it incorrect to say |She is a friend of mine?' Isn't that a double possessive? The |of signifies possession, so technically it should be |She is a friend of me.' Has |friend of mine' become accepted based on euphony?"
The of and the apostrophe make for a double possessive, which is idiomatically proper.
"Two conditions must apply for a double possessive
to occur: The word after 'of' must refer to an animate object (in this case, Donald Trump); and the word before 'of' must involve only a portion of the animate object's possessions."