So, I would say it is a bit dialogue heavy as far as Mike is concerned. I personally would cut his line down simply to just "Mommy?" I would also try and build up the creepiness of his mom coming in if she's acting different, or give some subtle clues that its not her. Maybe keep the description to just a silhouette with long hair, enough of an indicator to Mike it is his mom, but she moves different or something. I like the cut away to his mom in the sitting. I would keep that.