There are 2 father and 2 sons and there's only 3 roti's, everyone of them will get one roti each HOW?

Question

Shahrukh, father of nine sons got 81 goats labeled as 1,2,3,4..... 81. The beauty of the label is such that the buffalo with label-1 gives 1-liter of milk, buffalo with label-2 gives 2-liters of milk..... Buffalo with label 81 gives 81-liters of milk, Shahrukh wants to distribute his 81 goats among all his sons such that each of them gets the same number of goats and the same quantity of milk.

Can you help him?

Answer 1

Because there are only 3 people A B and C such that
A father of B father of C
And
C son of B son of A
Totalling 2 fathers and 2 sons.