Grand Father, Father and Grand Son

Number Puzzle
One Grand Father, One Father and One Grand Son.
Sum of their age is 140 Years.
Grand Son’s age in month is equal to Grand Father’s age in years.
Grand Son’s age in days is equal to Father’s age in weeks.
What is the Age of all three?
–In Hindi–
Ek Dada Ek Baap Ek Pota 3no Ki Total Age 140 Years Hai Pota jitne Month Ka Dada utne Saal ka Pota jinte din ka Baap utne week ka hai Batao 3no Kitne kinte Saal k Hain?

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Grand Father, Father and Grand Son