"Blue Bloods" is a popular CBS crime drama that revolves around the Reagan family. Unlike typical families, they all work in law enforcement and gather for Sunday family dinners regularly. Five cast members have appeared in every aired episode, including Tom Selleck, Donnie Wahlberg, Bridget Moynahan, Len Cariou, and Will Estes. Andrew Terraciano, who plays Sean Reagan, has missed only one episode, while his brother Tony has appeared in 187 episodes. The show also features romantic storylines, with a recent Valentine's Day clip showing the family recalling their first kisses. Actor Nick Gehlfuss, who appeared uncredited as Jimmy the Bookie in Season 2 Episode 8, has also starred in other well-known series like "Chicago Med," "Person of Interest," "Shameless," "The Glades," and "Rizzoli & Isles."