As of May 2015, cast members who have appeared in over 100 episodes of "Blue Bloods" include Donnie Wahlberg, Bridget Moynahan, Will Estes, Len Cariou and Tom Selleck. Amy Carlson, Tony Terraciano, Andrew Terraciano and Sami Gayle have also starred in over 100 episodes of the crime drama.
"Blue Bloods" is a show centering around the Reagans, a law-enforcement family that serves on the New York City Police Department. Several of the main cast members play members of the Reagan family. Donnie Wahlberg plays Danny Reagan, a married detective and father of two sons. Bridget Moynahan's character is Erin Reagan, a divorced assistant district attorney. She was formerly married to Jack Boyle, and her name was Erin Reagan-Boyle prior to season three.
Jamie Reagan is the character played by Will Estes. Although he is a graduate of Harvard Law School, the character decided to become a police officer following a stint at a law firm. Frank Reagan, Tom Selleck's character, is the police commissioner on the show. He is widowed, and Jamie, Erin and Danny, all members of the police force, are his children.
Frank's father is Henry Reagan, played by Len Cariou. On the show, it is common for Henry, a retired police commissioner, to offer his wisdom to his younger family members.