Grandson age in Month is same as grandfather's age in the year, grandson age in days is same as father's age in week?

Question

In English
The grandson age in Month is same as grandfather's age in the year,
The grandson age in the days is same as father's age in the week

What is the age of Grandson, Father and Grandfather?

In Hindi
पोता जितना महीना का
दादा उतना साल का
पोता जितना दिन का
बाप उतना सप्ताह का

तो बताओ कौन कितने कितने साल का है ?

Answer 1

Grandson: 7 Years
Father: 49 Years
Grandfather: 84 Years

Working
Assume Grandson Age: a
Assume Father Age: b
Assume Grandfather Age: c

c=12a
b*52.14=365a
Adding the above value solve the equations.