The famous family you didn't know is related to NCIS star Mark Harmon

Thanks to his role on "NCIS" and others, Mark Harmon is a legit star in his own right. But he also comes from a family of ...
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'NCIS' Fans, Did You Catch Mark Harmon's Rare Family Update?

Actor Mark Harmon played Leroy Jethro Gibbs on NCIS for 19 seasons. The former CBS star became a first-time grandfather earlier in 2025. Mark's daughter-in-law Courtney Prather revealed she and ...