They have never really been all that clear about it. I know he was raised by his dad and they implied in another episode a couple of years ago that his mother had died when he was young.
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While the television show NCIS is based on a real government organization, the character Jethro Gibbs is completely fictional. Mark Harmon is the actor who portrays Gibbs on the CBS tv series.
Army Colonel Hollis Mann i think.
Jethro Tull - band - was created in 1967.
No. By the way, Jed and Jethro were NOT Father and Son.
Gibbs cam