Jonathan Michael Gavin is a fictional character on the FX drama Rescue Me. The character is played by Charles Durning. Michael Gavin is a retired New York City Fire Department Firefighter and a World War II veteran.Michael (earlier called John) and his wife Martha have six children together (Tommy Gavin, a New York City Firefighter, Johnny Gavin, a New York City Police Detective, Maggie Gavin, Rosemary Gavin, Timo Gavin and an unnamed sibling, most likely a brother).