There's not much narrative technique in Home Alone—it's the simple tale of a child inadvertently abandoned, who proceeds to save his home from robbers. No one's at risk of confusing its technique with, say, the disjointed narrative in Pulp Fiction. We follow one story—Kevin's.
Even Kevin's mom's journey is essentially about Kevin and the fact that he's been left home alone. Briefly, we see the other McCallisters hanging out at their uncle's apartment in France—but still, they're talking about how they're worried about Kevin. So, the story sticks entirely to developments with Kevin and with his family, as they first forget him and then realize he's missing.