There’s a song that goes “we could build a house, we could plant a tree … ” but nowhere in that song does the potential of a house in a tree appear. It’s too bad, because treehouses can be a fun way ...

Pete Nelson of Nelson Treehouse & Supply in Fall City has built almost 400 treehouses across the world, starting when he was 7 with his dad. Now 62, he is something of a grandfather and ambassador to ...