Solution: The Relative Riddle
The Relative Riddle stated: Two fathers and two sons went fishing.
Each of them caught a fish and none of them caught the same fish.
However, they only caught a total of three fish. How is this possible?
The only way this riddle makes sense is if there are three fishermen.
Therefore, one of the fathers in the riddle must also be a son. This works
if the three fishermen are a father, his son, and his son's son (grandson).
The apparent discrepancy occurs because the second person above fits
into two categories -father and son. However, just because he fits into
both categories doesn't mean he should be counted twice.