It's funny though, because if you choose Spacer, you basically had a peaceful upbringing and your mom (or dad?) is an admiral in the fleet. I *think* that comes up in ME3, and you're given an opportunity to ask if they're okay after the attack on Earth, but I could be making that up.
After Rannoch, Hackett tells you that Hannah Shepard has been located, recruited for the Crucible project, and promoted to Rear Admiral.
And I just realized that, even though I'm pretty sure one of my Sheps had a Spacer background, I never went through the Spacer quest in ME1...