In Bao's family, the father is 3 times as old as Bao and the grandfather is 7 times as old as Bao. Given the ages sum is 132. What is Bao's ages? How old is his father? How old is his grandfather

In Bao's family,the father is 3 times as old as Bao and the grandfather is 7 times as old as Bao.Given the ages sum is 132.
    What is Bao's ages?
    How old is his father?
    How old is his grandfather?