Final answer:
The central concept of the theory of family developmental stages is that family needs differ as they progress through various unique challenges during each stage of the family life cycle.
Step-by-step explanation:
When attempting to meet the needs of the family, the nurse recognizes the central concept of the theory of family developmental stages is that needs differ as the family progresses through the various stages. The family life cycle was developed to explain the different processes that occur in families over time, with each stage having its own unique challenges and needs. While it was once common to apply a linear model of these stages, modern approaches recognize the diversity of family forms and adopt more fluid models that are less rigid and account for the variability in family life practices.