According to Nnaemeka, he wish to wait until he is home on leave to tell his father about his engagement to Nene because "It is tradition in his village that the father bless the marriage, and Nnaemeka wants his father to meet Nene first".
This is a part of culture that is passed from person to person or generation to generation, differing in detail from family to family, such as the way to celebrate weddings.
In most African cultures, it is tradition for intending couples to receive blessings from parents and elders in the family before they become husband and wife.
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