To people who complained (and are still complaining) that the family was idiotic when stuck between Zod's Heat Vision and could've just travelled to their left, I managed to get my hands on that scene and deconstruct it for myself (for obvious reasons, I'm not going to post it here).
The verdict? The family was barricaded by the debris (not a stairwell or anything) from Superman and Zod's entry into the station. So really, they couldn't move past the left even if they wanted to. Thus, the only choice was for Superman to kill Zod, and the family wasn't idiotic (heck, that's a very brave father there for shielding his family from the heat vision).