The challenge to the patriarchy by Okeke's change in attitude happened this way: O "Okeke wants to see his grandsons even though they are not the product of a traditional arranged marriage."
In some traditional societies, the oldest man (patriarch) in the family ultimately determines all issues. He approves, for example, the spouses that his family members would marry.
However, this patriarchal cultural practice would be challenged as young men and women migrate to the cities, where they meet other young men and women from various cultural backgrounds.
There is bound to be intermarriages, which would draw the ire of patriarchal traditionalists. This is exactly what happened in "Marriage is a Private Affair," a short story by renowned novelist, Chinua Achebe.
In the story, Okeke refused to allow his son Nnaemeka to get married to Nene, who was not from his Ibo tribe. But Nnaemeka would not be dissuaded from the marriage with his heartthrob. Instead, he risked being ostracized by his family and tribe.
Fortunately, Okeke was a man of conscience who could not continue to insist on patriarchy when he longed earnestly to meet his grandchildren, the products of the unapproved marriage.
Learn more about Okeke's attitude in "Marriage is a Private Affair" by Chinua Achebe here: https://brainly.com/question/1031872