Please give a summary of "Marriage is a Private Affair."

This excellent short story by Chinua Achebe concerns the
return of a young Ibo man named Nnaemeka from Lagos in Nigeria to the countryside where
he was born and grew up. He tells his father that he wishes to marry Nene, a young woman
that he met in the big capital city. However, Okeke, his father, refuses to accept this
marriage because Nene comes from a different tribe. In fact, as it is expected, Okeke
has chosen a wife for his son from their tribe. Nnaemeka, however, rejects his father's
will and shows a determination to marry the woman that he chooses for himself. Because
of this, he returns to Nene and the city. Equally stubborn, Okeke refuses to accept the
wedding picture that his son sends him, cutting Nene out of it as a symbol of the way
that he cannot accept his marrige. It appears that no reconciliation is possible. It is
only much later on that Nene writes to her father-in-law saying that her two sons want
to meet and to get to know their grandfather. It is this move that makes Okeke regret
his actions at distancing himself from his son and his grandchildren, and as the story
ends we see Okeke resolving to make up for the time that he has
lost.