CBS is expanding the Blue Bloods universe with its Boston Blue spinoff - but who makes up the cast? Blue Bloods, which premiered in 2010, followed the lives of the Reagan family, many of whom worked for the NYPD under the leadership of NYC police commissioner Frank Reagan (Tom Selleck). Frank and his father, Henry Reagan (Len Cariou), were central to the show alongside Frank's children: daughter Erin Reagan (Bridget Moynahan) and sons Danny (Donnie Wahlberg) and Jamie Reagan (Will Estes).