Three Pheasants

Classic Problem
A man has $3$ pheasants that he wants to give to $2$ fathers and $2$ sons, giving each of them $1$ pheasant.

How can this be done?

Solution
To make this question tighter in structure, it should be stated that each of the $2$ fathers is actually the father of one of the $2$ sons.

In order to give $3$ pheasants to $4$ people so that each gets $1$ pheasant, it must be the case that $2$ of the $4$ people are actually the same person.

The only way to do that is to arrange that one of the fathers is also one of the sons.

So
 * One of the fathers gets one pheasant.
 * One of the sons gets one pheasant.
 * This son is also the other father.
 * The son of this other father is the other son.

So the $3$ people involved are grandfather, father and son.