Sunnyside, Washington. But with three kids, including one with special needs, and another on the way, their design must be extraordinary and touch on a range of ages and personalities. The super-deluxe tree house sits atop the trunk of a century-old reclaimed oak tree and comes complete with a playful slide and a set of monkey bars. The finishing touches include driftwood collected from the California coastline. Back at home, John teaches his 12-year-old niece, Ron’s daughter, how to carve a Polynesian-style Tiki mask with a chainsaw so she can scare her siblings at a surprise reveal at the family’s three-story hidden tree house.