Answer:
The right-handed twin deceives and kills his brother and grandmother, showing that nothing is entirely good.
Step-by-step explanation:
According to the Iroquois, the right-handed was the twin of good. He was honest, kind and gentle and was responsible for creating the good things in the world, unlike his brother, who was the evil twin.
However, the Iroquois claimed that nothing in the world is totally good. And to prove it, they showed the reading where the right-handed twin, despite always promoting good and peace, deceived and killed his brother, in addition to killing his grandmother, because she preferred the left-handed twin.