who plays linda reagans brother on blue bloods
List of Blue Bloods characters Frank married Mary Margaret Reagan in the early 1970s, and they have four children together: Danny, Erin, Joe, and Jamie. Each of Frank's sons followed him into the NYPD: Danny (Donnie Wahlberg) is a Detective 1st Grade and lead investigator with the 54th Precinct's Detective Squad; Joe was a Detective with the Warrants Squad who was murdered on the orders of his partner Sonny Malevsky (Michael T. Weiss), the leader of a corrupt gang of police officers called the Blue Templar;[2] and Jamie (Will Estes) is a patrol officer assigned to the 12th Precinct with a law degree from Harvard University. Frank's only daughter, Erin (Bridget Moynahan), is also in law enforcement as a Manhattan Assistant District Attorney. Erin was promoted to Deputy Bureau Chief of the NYCDA's Trial Bureau in 2013.[3]