This doctoral project educates mental health professionals on the impact a chronically ill child has on healthy sibling's development and relationships. Chronic illness is defined as a period of continuous hospitalizations of more than one month or a condition that persists longer than three months in a given year (Pless & Pinkerton, 1975). A family is a system; the reactions of an individual member of a family affect both the whole system and each member in it. Thus, when a child within the family is diagnosed with a chronic illness, each member in the family is affected, including the healthy siblings. Healthy siblings experience significant disruption when a child is diagnosed with a chronic illness and this may affect their ability to cope, adjust, and develop. The author conducted a selective literature review related to healthy siblings, chronic illness, coping, development, and adjustment; and, conducted field consultant interviews in order to create a more balanced literature review and professional presentation. The presentation intended to increase professionals understanding of how healthy siblings' are affected by having a chronically ill brother or sister and to offer effective interventions for providing support for healthy siblings. The author provided additional limitations, suggestions for future research, and the implications of the project.