Based on "Marriage is a Private Affair," what can you depict as the shared characteristic between the father and son?

The father, Okeke, and son, Nnaemeka, in this story have presumably had a happy and fruitful relationship prior to Nnaemeka's decision to marry a woman not of his father's choosing—and, importantly, not an Ibo. In terms of their adherence to the cultural norms of their tribe, father and son are different; Nnaemeka lives in a more modern, cosmopolitan world, and does not believe he can marry someone he does not love. However, in terms of their personality, there are indications that the two are fairly similar.
Nnaekema knows his father well. At the beginning of the story, he anticipates correctly how his father will react to the news of his engagement. He also insists that, because his father is a good person and a product of his culture, he will forgive Nnaemeka eventually—which does turn out to be true. But Nnaemeka has evidently never truly disappointed his father before, and is alarmed by his reaction to the news, the "silence . . . infinitely more menacing than a flood of threatening speech."
What is notable in Nnaemeka's approach to his father is that he does not at any point ask permission to marry Nene. Instead, he asks "forgiveness." It is quite clear that Nnaemeka has already made up his mind and will not be dissuaded from his course. He is simply trying to ascertain the best way to explain the situation to his father. Nnaemeka is strong-willed and stubborn. Likewise, Okeke is wedded to his ideas and his view of the situation. While he believes that Okeke will eventually "kill himself" through this match, he will not allow the herbalists in the village to meddle in it, thinking that if he only waits long enough, Nnaemeka will change his mind and see the error of his ways. This is, of course, also what Nnaemeka is hoping from his father. The two strong wills endure for eight years, with father and son never seeing each other.
At the very end of the story, it is Nene's emotional appeal to Okeke on the part of his grandchildren which breaks through the old man's stubbornness and stimulates his "remorse." It seems likely that, without her intervention, these two men of equally matched wills may have never been reconciled, neither one willing to surrender his position.