Two grandparents, two parents, and three grandchildren make up a family. The average present age of the grandparents is 67 years, that of the parents is 35 years and that of the grandchildren is 6 years.What is the present age of the family (in years)?

A

$$33\frac{4}{9}$$

B

$$31\frac{5}{7}$$

C

$$27\frac{3}{7}$$

D

$$34\frac{2}{5}$$