Younger brother of Arthur Wahlberg, Donnie Wahlberg and Robert Wahlberg. His older siblings are: Arthur Wahlberg, James Wahlberg, Debbie Wahlberg, Michelle Wahlberg, Paul Wahlberg, Tracey Wahlberg, Robert Wahlberg and Donnie Wahlberg. Robert, Donnie and Mark are from their mother's third marriage with Donald Wahlberg.
Blue Bloods ActorsTv Blue BloodsBloods CastBloods Tv STv ReaganReagan BlueReagan FamilyJoe ErinDanny JoeForward. Joe Reagan the second oldest son (So that concludes: Danny, Joe, Erin and Jamie in order or Danny Erin Joe and Jamie)
From 2002 to 2003, he starred in the crime drama Boomtown. He has been starring in the drama series Blue Bloods as Danny Reagan with Tom Selleck (his TV father) and Bridget Moynahan (his TV sister) since 2010, and since 2014 is an executive producer of the TNT reality television show Boston's Finest.