Upstairs

Upstairs there are two bedrooms, one obviously belonging to the parents and the other seemingly belonging to a crazed toddler.  All of the furniture is small, but the décor is decidedly sinister.  There's a large black armoire with bizarre symbols on it.

At the far end of the room there is a popsicle stick house that says "Mystery Shack" on it, surrounded by small wooden figures that seem to represent people.

There is a piece of paper laying on the desk near the door.

Look at the paper.

Investigate the diorama.