Even though CBS' "Blue Bloods" mostly centers on the criminal justice system, anyone who spends anytime watching it quickly figures out that the heart of the series is actually the Reagan family. Of course, just about every episode of "Blue Bloods" features one of its famous Sunday family dinners, regularly featuring the oldest and youngest Reagan family members. Normally, the head and the foot of the table are occupied by the patriarch of the Reagan family, former New York City Police Commissioner Henry Reagan (Len Cariou), and his son, active duty New York City Police Commissioner Frank Reagan (Tom Selleck), while the rest of the chairs are taken up by the families of their respective children and grandchildren. Remarkably, most of the cast from the pilot episode still appears in Season 12 all these years later, with only a handful of exceptions. So, which members of the "Blue Bloods" cast have never missed a Sunday family dinner? The series regul...