Sean Murray has been on the series, NCIS since the early beginnings of the show. He also has family ties to the show and Hollywood, with an enormous and talented family tree...
NCIS Star Sean Murray: These are his siblings
Let's take it back to his childhood - his parents divorced when he was younger, and his mom, Vivienne Bellisario eventually married producer and screenwriter Donald P. Bellisario.
Bellisario is the creator and writer of shows like Magnum P.I., Tales of the Gold Monkey, Airwolf, JAG, and *drumroll* NCIS. Murray's only brother Chad, has also served as a producer for NCIS: Los Angeles.
Sean Murray's half-sister: Actress Troian Bellisario
Despite only having one biological brother, Murray has seven step-siblings: 4 step-sisters and 3 step-brothers. One of his step-sisters is Troian Bellisario, who you may recognize from the series, Pretty Little Liars.
Another one of his step-sisters is producer and writer Julie Bellisario Watson. His step-brothers also all work in Hollywood. Michael Bellisario is an actor, Nicholas Bellisario is a producer, and David Bellisario is a screenwriter.
Talk about a small world in the realm of entertainment... and royalty!