This study aims to develop, implement, and evaluate a stage-matched psychosocial intervention to enhance the psychological adaptation of parent caregivers of children with leukemia in Pakistan. The intervention is based on the Transactional Family Adaptation Model and Double ABC-X Model of family stress. It will be tailored to meet the specific emotional and behavioral needs of caregivers at different stages of their child's treatment journey. The study consists of four stages: (1) needs assessment, (2) intervention design, (3) intervention refinement, and (4) a pilot randomized controlled trial. The intervention will be tested at two tertiary care hospitals in Pakistan, with an expected sample size of 88 parent caregivers. Outcomes will assess feasibility, acceptability, and preliminary efficacy in improving psychological adaptation, reducing distress, and enhancing coping skills among caregivers.