$A$ family consists of grandparents,parents,and three grandchildren. The average age of the grandparents is $67 \text{ years}$,that of the parents is $35 \text{ years}$,and that of the grandchildren is $6 \text{ years}$. What is the average age of the family? (in $\text{years}$)
- A$28 \frac{4}{7}$
- B$31 \frac{5}{7}$
- C$32 \frac{1}{7}$
- D$29 \frac{4}{7}$
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