The TV show "Blue Bloods" stands out by focusing on the family aspect of its characters who work in law enforcement. Unlike other police procedurals, the central cast are actually related, the Reagans. The show explores how their work issues can affect their personal lives, especially during their weekly family dinners. However, two important family members, Betty and Mary Reagan, have never been seen on the show. Betty died of illness in 2001, while Mary succumbed to cancer in 2005. Their legacies continue to impact their family members.