I go with number 2.
Reason.
That number 1 was the real fact about life, nobody can change that...
That number 3, it may probably be that the guy was an imbecile, so, he could do crazy things...
BUT that number 2, how on earth will two brothers from another parent has the same reasoning faculty...If one was imbecile, does it affect the second man??...
Maybe the duo are from North & South-South respectively(nah joke make you no take ahm serious o)...