Wasepuka na mbuzi

There was once a pair of twin boys who were herding their goats. They decided to try to find out which was the fatter abd so they cut each other's stomach open to find out. The second twin died from the woound. A bird saw all this and went to tell their parents. When questioned the other twin lied saying that the second twin had been gored by a goat. Thereupon the people took the twin and killed him too for killing his twin brother. (The story was not fully finished on the record). Story with son