Final answer:
The Mr. and Mrs. Smith family consists of 9 people: the parents, 6 daughters, and 1 brother.
Step-by-step explanation:
To calculate the number of people in the family, we need to consider the parents and their children. The question states that Mr. and Mrs. Smith have 6 daughters and each daughter has 1 brother. We know that the 6 daughters are siblings, so they share the same set of parents, Mr. and Mrs. Smith. Therefore, the family consists of the parents, the 6 daughters, and the brother. Adding them up, we have 1 father, 1 mother, 6 daughters, and 1 brother, which gives us a total of 9 people in the family.