For this question, our main resource was the Effgen text (Meeting the Physical Therapy Needs of Children). The book gives a nice overview of family-centered care/intervention and the different frameworks. There is also an article that describes family systems theory: Foster MA, Phillips W. Family systems theory as a framework for problem solving in pediatric physical therapy. Pediatric Physical Therapy. 1992: 70-73. It is an older article but gives a nice description and some case examples. Let us know if these are helpful references for you and if you have any additional questions!