The transformation of the grandfather in this story is the key to answering this question. He starts off completely opposed to his son's marriage outside of his tribe, and cuts off all communication because he is unable to accept his son's wife. However, what manages to break through the impasse of his stubborness is the letter that his daughter-in-law sends to him about his grandsons and how they ask about him constantly. This triggers a massive internal conflict within him as he resolutely tries to ignore the thought of his grandchildren, but eventually has to admit defeat:
Okeke was trying hard not to think of his two grandsons. But he knew he was now fighting a losing battle. He tried to hum a favorite hymn but the pattering of large raindrops on the roof broke up the tune. His mind immediately returned to the children. How could he shut his door against them? By a curious mental process he imagined them standing, sad and forsaken, under the harsh angry weather—shut out from his house.
The pathetic fallacy of the weather and how he imagines his grandchildren to be trapped outside in this angry weather is of course a powerful symbol expressing his own stubborness and how his grandchildren are suffering as a result. What overcomes his tribal prejudice therefore is the thought of him dying without ever getting to know his grandchildren, and robbing both them and him the chance of enjoying a relationship together. The story ends with the grandfather's fear that already he might have left it too late.
the story "Marriage is a Private Affair" shows how two children can reunite a family.Okeke is against Nmaemeka's marriage to Nene who belongs to other tribe.He has no conversations with his son yet he doesn't stops loving his son.He had no contact with his son since the last eight years but Nene's letter about Okeke's two grandsons starts to melt him.The thought of his grandsons made Okeke thoughtful and he couldn't prevent himself from thinking.Even the nature reflects Okeke's feelings and thoughts and the slow breakdown of his in-built resolution.Finally Okeke imagines his grandson standing outside his house longing to get inside and meet their grandfather.At the end Okeke fears that he might not make up to his grandsons.But we can expect a family reunion!!!!!