Bob Barnes + his son....

You are right that Bob is a CIA field agent. His wife (and his son Robbie's mom), is also a CIA agent, stationed in Islamabad, Pakistan. Bob doesn't see his wife very often, as they are both married to their careers. She is never seen in the film.

Robbie lives with his mom, and he hates living in Pakistan, and he hates that neither of his parents will be straight with him about what they do for a living. His suggestion that his dad could be "made ambassador to France, Italy, or Ghana" is just wishful thinking, of course.

At this point in the film, Bob assumes that he will be getting a transfer to a desk job at Langley, and Robbie will come back to the U.S. to attend college - that's why they're visiting Princeton, although Bob would prefer the University of Maryland, where he has residency, so the in-state tuition would be more in line with his salary.

After their visit to Princeton they have lunch in a Lebanese restaurant, where Robbie and Bob both pour on the hot sauce.

The scene is problematic for some directorial reasons. First, it's somewhat typical of Gaghan's low level of narrative disclosure: he seems to like to let viewers piece things together rather than be very explicit and is willing to let things be less than clear in achieving that.

Second, the first part of the scene is in one location. We cut to the kitchen/food preparation, track with the prepared plates of food being carried by the server to Bob/Clooney and son Robby and they are in a different location (which is not necessarily a Mexican restaurant--I know you're cuing off what kind of food appears to be on the plates; but the other responder herein says Lebanese restaurant and I think that may be it). The dialogue of conversation is nearly uninterrupted on the soundtrack through the location change. But they are wearing the same clothes.

Oddly, Clooney is seemingly distracted in both locations by young girls who we only hear off-screen in the first location, but then see at an adjacent table in the second (they are the ones from whom Robby borrows the sauce).

My reading is that Robby was referring to himself and Mom when says "we" in asking "What does Mom do again that that we have to live in Islamabad?" My reading was that he has already been living in Pakistan, not that he's going there and needs a car. He says "So I know it's still a year away . . ." to introduce his request for a car. I think he's *preparing* for his hopefully "normal" senior year at Princeton in asking for a car ("so that [he] can get into Boston and New York"), not preparing for Pakistan.

Yall see it completly wrong. Without this scene you wouldnt be so fast to feel for Bob-whats-his-name. Its there to show that Bob-whats-his-name is a *beep*-up in life so you would petty him and not think to harschly of the guy when he attempts to kidnap and probably execute nassir, the only good guy in the movie.
It served its purpose, so what now theres a plothole, its how Hollywood portraits characters, and they cross there fingers in the hopes noone notices it, reading these posts, they succeeded once again apparently.
_____________________
Any last words ?
Shut the *beep* up
-Mutant Chronicles-

I took the son's asking about a possible ambassadorship to mean that Bob's 'cover' is that he works for the State Department (not unheard of for CIA agents). Apparently the mom is also undercover: the son asks about what she does, Bob hesitates then says she's a secretary, and the son angrily replies that both his parents are "professional liars." I got the impression that his parents haven't even admitted to him they're CIA, but he's figured it out.