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Tony, Ziva and McGee were in the Bullpen working on paper work from there last case. When Gibbs, Abby and Ducky appeared from the back elevator, just as the main elevator went "Ping" and off stepped two women and one of the security people from main entrance. Tony said hello to Henry the guard and eyed the two women suspiciously not knowing who they are. Ziva also looked at them curiously, Tim stood and addressed both women as "Mom, Grams what are you doing here, I wasn't expecting you". Tony and Ziva mouthed "Mom, Grams".
Tim's mom looked at him and said "Timothy mind your manners and introduce us" Tim began Boss, Tony, Ziva, Abby and Ducky I like you to meet my mother Lilly McGee and her mother Meredith Darville. Mom, Grams I like you to meet my boss "Special Agent Leroy Jethro Gibbs, Special Anthony DiNozzo, Ziva David, Abby Sciuto and Dr. Donald "Ducky" Mallard. Everyone said hello to each other except for Tim's Grams and Ducky. Tim and his Mom both realized how quiet his Grams became (and knowing her that was normal). Gibbs, Tony, Ziva, Abby and Tim also realized how quiet Ducky became.
Tim knowing were both Ducky and his Grams were originally from asked jokingly asked if they knew each other and they both answered. Yes.