Why does Okeke oppose Nnaemeka's choice of a wife?

Okeke
opposes Nnaemeka's choice of a wife for three reasons. The most important reason is that Nene is
from a different ethnic group than Nnaemeka. She is Ibibio and he is Ibo. Even though both
groups are from southeast Nigeria, they rarely entered into mixed marriages until modern times.
The couple have moved to Lagos and broken tradition by marrying each other. The men of Okeke's
village agree with him in his disapproval of the marriage. One man says, "It has never been
heard" and...