A family consists of grand parents, parents and three grand children. The average age of the grand parents is $67\, years,$ that of the parents is $35\, years$ and that of the grand children is $6 \,years.$ What is the average age of the family? (in $years$)

  • A

    $28 \frac{4}{7}$

  • B

    $31 \frac{5}{7}$

  • C

    $32 \frac{1}{7}$

  • D

    $29 \frac{4}{7}$

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