How did robinson's family make its house on the tree?

The details of how Robinson's family made their house on the tree are not explicitly mentioned in the question. However, based on the context provided, we can assume that Robinson's family built their house on the tree using various construction techniques and materials. They might have used wooden planks, nails, and other tools to create a sturdy structure on the tree branches. Additionally, they might have used ropes or ladders to access the tree and build the house. The specific methods and techniques used would depend on the resources available to Robinson's family and their level of expertise in construction.