Background: Globally, many infants and children are diagnosed with illnesses that impose limitations on their well-being and life course trajectory. Children’s care becomes the central focus of family life. Inadequate support for parents is detrimental to their well-being and management of their child’s care and support needs. Methods: The second phase of this evaluation study followed a quasi-experimental crossover design to test a theory-based psychosocial intervention, the Keeping Hope Possible Toolkit.