A nurse is comparing several different families' developmental stages.What serves as a marker for a family's developmental stage according to Duvall?

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According to Duvall, the oldest child's age serves as a marker for a family's developmental stage. This is because the age of the oldest child can indicate the length of time that the family has been in the parenting role and the developmental tasks that they have been through.

A Nurse Is Comparing Several Different Families' Developmental Stages