Stretching between two towering pines, the treehouse seems like something out of “The Swiss Family Robinson.” It’s a place where imagination and adventure can thrive, but it’s also something more – a memorial to a vibrant woman who died much too young. Brendan Wiechert always wanted to build a treehouse for his children Emma, 12, and Calen, 9. “I had an idyllic childhood,” he said. “We lived in a neighborhood with 12 kids and we’d play hide-and-seek, four-square, football.”