Question

An old lady left $33,333 to be divided equally among two fathers ................How was this possible? An old lady left $33,333 to be divided equally among two fathers and two sons and each was to receive $11,111. How was this possible?

Answer 1

There are only 3 people : a grandfather ,a father and a grandson 
The "father" is both i.e. 
1. a father of the grandson and
2. a son of the grandfather 
i.e. the above 2 people is only 1 
so 
33,333 / 3 is 11,111