The document discusses the family systems theory and its key models. The family systems theory proposes that what happens to one family member impacts everyone. It describes three models: developmental contextualism which sees the family as transforming context for children; the circumplex model which shows families varying in cohesion and flexibility; and the family life cycle model tracking stages like families with young children. The document then analyzes the author's family, finding they fall in the midrange, with extreme cohesion but balanced flexibility, currently in the family life cycle stage of families with young children.