Pool is an activity kit that helps family members to connect with each other and builds family strength, by making them more aware and appreciative of each other. It builds on the idea that more aware and appreciative family members can lead to a greater perception of family strength. This family strength leads to a greater sense of self efficacy; the family feels more capable of handling their challenging situation. Pool was developed under the ‘Meedoen= Groeien!” project, which is a collaboration between the Rehabilitation Fund, the Princess Máxima Center for Pediatric Oncology (PMC) and the Delft University of Technology (DUT).