Blue Bloods' title includes a double meaning of sorts. On one hand, it points to the fact that each member of its central cast works in law enforcement. Simultaneously, it evokes the fact that each of its main characters is related to one another. Thus, "blood" refers to both the professional and familial identities of its protagonists.
The members of the Reagan family at the series' core all work a different profession under the law enforcement umbrella. Tom Selleck's Frank Reagan, for example, is the commissioner of the New York City Police Department. His daughter Erin Reagan (portrayed by Bridget Moynahan), meanwhile, is an assistant district attorney.
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