Sara, Adam and David's mom, brings home supplies to build a "Tree Stump House".  It's like a tree house, only it is merely set upon a tree stump in their backyard.  Aaron, their dad, also joins the fun, with all of them working together as a family.  David hurts himself while hammering, and Sarah helps and comforts him.  David persists with his hammering.  In the end, Aaron and Sarah raise the house up onto the tree stump, which Adam and David use for playing and pretending in.