This article presents a family systems approach to the assessment and treat
ment of children and adolescents with physically manifested illness. A biob
ehavioral continuum of psychologically and physically manifested disease is
offered to replace the false dichotomy of organic versus psychological ill
ness. The Biobehavioral Family Model, an empirically validated model of the
mutual influence of family relational patterns and childhood illness, orga
nizes the treatment approach. The Family Process Assessment Protocol provid
es a method of diagnosing the child's illness in the context of family rela
tional functioning. Two cases, a child with conversion disorder and a child
with asthma, illustrate this approach. Additional family systems approache
s are referenced in a table with citations.