My Three Sons Season 9 Episode 7

One of the most famous episodes of the entire series includes the classic final scene between Robbie and Katie which sums up the entire show, when she says 'What are you thinking?' and he replies, 'I am thinking about how much I love you, and My Three Sons'

Even though in the show Robbie had already been previously doing his Army Reserve training, before this season began shooting, it seems that actor Don Grady, who was 23 at the time, had joined the Illinois National Guard (although he was a California resident). Finding a Guard unit in another state who had openings was a popular option in that era. You went to basic training and then were assigned to your Guard unit waiting for call up, which typically didn't happen as the draft filled the army's needs. He did basic training at Ft. Bliss, Texas, in January of 1968.
[Thanks to David Covert - who did his basic training with Grady - for supplying this information].

In a 1991 interview on the Lifetime channel Tina Cole recalled "Do you remember my labor? I was carrying triplets. My labor was: (Tina makes a surprised expression on her face) "Oh?" (laughs) "I think?" (more laughs) "Yes" (more laughs). That was the total labor."