[double genitive] n (1824): a syntactic construction in English in which possession is marked both by the preposition of and a noun or pronoun in the possessive case (as in "A friend of Bob's is a friend of mine")--called also double possessive
DOUBLE GENITIVE
Meaning of DOUBLE GENITIVE in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012