In a dispute, people say that there are two sides to a story....?

Two sides? Think again..! There is only one side to a story and it is the truth.
What happens is that people confuse happenings and mingle stories around.
One needs to go to the beginning, what Richard Bruce in his book "the Entrepreneur" calls the "determining event" or the BIG BANG. That is the truth. It is from here that the story starts.