<P> In "Humbug", an armed robber threatens Joelle in public after stealing some malware from a defense contractor . When it is learned that the robber placed the stolen malware on Joelle, Callen is forced to put himself in danger to protect her, eventually being forced to reveal to her that he is an NCIS agent . Although hurt by this revelation of Callen's deception, she eventually accepts to continue their relationship as long as he tells her more about himself . Callen and Joelle are confirmed to be still together by both Sam and Callen himself . Callen later tells the team he would not be against starting a family with Joelle . </P> <P> Callen realises Arkady Kolchek knows more about his father than he's revealed and when a mission to find a ship with stolen barrels of oil leads to Russia, Arkady accompanies the team . Whilst there Arkady takes Callen to a coffee shop & show him a photo of Callen's father from the 1980s, long after he was supposedly sent to the Gulag . Hetty discovers through Eric's hacking, that his father took the name of Chernoff . Callen realises he was working in Moscow at the same time his father frequented the city . </P> <P> In season seven, Callen admits that he and Joelle are not suited and rowing a lot . They break up off screen but still spend Christmas together to avoid being lonely . In "Matryoshka, Part 2", Callen meets his father in Russia who reveals that his birth name is Grisha Alekandrovich Nikolaev but had to leave before he could find out any more information . Callen has since updated his personnel records and credentials with his full name . </P> <P> Callen reunites with his father in "Glasnost", where he shoots a man who went after a woman victim he was visiting and reveals he had been in touch with Arkady Kolcheck since the Russia incident back in Season Seven . Callen interrogates his father, who admits he's in LA for work, not to see his son . After Hetty takes over the interrogation, she allows him to escape to finish what he started . Callen and Sam go to his rescue and Callen discovers that his father had a child with a woman after he helped her move to the U.S. That child has since become a parent, so Callen has a half - sister and is now an uncle . In the episode "Payback," Callen learns from Hetty that Joelle is an undercover CIA agent who has been assigned by rogue agency moles to spy on him . Feeling betrayed, Callen permanently severs his ties with Joelle . </P>

What is g's name in ncis la