Who is at fault?

Once upon a time there was a blind farmer who lived in a farm with his 3 sons. They were poor and had to strive to live from day to day. One day the youngest son suggested to both his elder brothers that they should work the farm by growing wheat. From wheat they can make bread and can sell and eat them. The elder brothers told they liked the idea but they were too busy to earn small pay from working at other people’s farms. Determined by his ideas, the youngest brother worked the farm and plant wheat on the farm. His hard work paid off when the wheat grew, ripe and were ready to be harvested. One day the blind farmer found out wheat were grown on his land and asked his 3 sons whose effort was that in growing the wheat. The first son claimed it was his and so did the second son. The third son who was so surprised of his brothers’ action, just kept quiet. The farmer was so pleased that later on he bequeaths the land to the first and the second son only.