Of greatest interest in the narrative so far is the powerful role of Katie Bowman (Sarah Wayne Callies), wife of Will (Josh Holloway). Indeed, her role is even a little more pivotal than Will's, seeing as how - as now is clear - she's not only actively working for the resistance but Will apparently doesn't know. Thus, when she tells her kids that she supports Will's working for collaborators because that can help locate their oldest son, that's only half true. The other half of the truth is Katie needs Will's information about what the collaborators are doing so she can report to the resistance.
Not that Katie is happy about being in such a difficult position - far from it - but the character navigates the difficult currents well, at least so far. At some point, Will will find out truth, with any luck before the collaborators do.
Will, by the way, is no pushover, and shares the same abhorrence of the collaborators as his wife. It's just a matter of time, at some crucial moment, when he breaks lose of the place he's in.
Significantly, we've seen no signs of the aliens themselves at this juncture in the story. All we know of them is their space-faring ships, and what they've done to Earth. There's a huge story to be told here, and if the no-holds-barred, lack of happy endings of the first two episodes provide any indication, we should be in for a rough and compelling ride.
See also Colony 1.1: Aliens with Potential
not exactly aliens, but strange enough ... The Silk Code