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The following items might be relevant to the discussion:
Kuznar, Lawrence A., William G. Frederick, and Robert L. Sedlmeyer. "The Effect of Nepotism on the Evolution of Social Inequality," in Studying Societies and Cultures: Marvin Harris's Cultural Materialism and Its Legacy. Boulder: Paradigm, 2007. 168-79.
White, Richard D. "Consanguinity by degrees: Inconsistent Efforts to Restrict Nepotism in State Government." State and Local Government Review 32 (2000): 108-20.
White, Richard D. "A Tale of Two Bureaucrats: Joseph Nourse, Oliver Wolcott Jr., and the Forerunners of American Public Administration." Administration & Society 40 (2008): 384-408.
There is of course also Adam Bellow's In Praise of Nepotism: A Natural History, but I get the feeling (evoked from both academic and popular reviews) that the work relies more on the Natural and less on the History; for myself, I can do unto eternity without people making claims from "human nature."
FYI, being not a student of the Social Sciences, I managed to turn up only those few records above using the short list of Poli-Sci databases with which I am familiar; were the conversation to steer itself toward the finer points of nepotism among the kingdoms of Anglo-Saxon England or within the world of Beowulf, I'd probably fare better.