Henry Reagan is a character (portrayed by Len Cariou) on Blue Bloods . Reagan is a retired New York cop who also once served at the City Police Commissioner. Henry's son is Francis Frank Reagan (played by Tom Selleck) and his daughter is Erin Reagan-Boyle (played by Bridget Moynahan). Frank too is a former cop who is now the acting City Police Commissioner.Although they play father and son, Len Cariou is actually only 6 years older than Tom Selleck in real life.