Once upon a time there was a family; the father and mother and their two sons. They were living happily until the man began to come home late from work.
The man will be drunk by the time he comes back home and the wife was not happy at the turn of events in the family.
Eventually the man told his wife he is bringing home another wife, thou the wife was not happy about that but there was nothing she could do to stop his husband from going into such a venture.
So the second wife joined the family, and eventually got two daughters for the man and these two daughters grew up.
Meanwhile, the two sons of these man had gone to live separately on their own being fully grown up men as at the time their half blood sisters were growing up.
These two daughters of the man deliberately began to visit their brothers to demand for sexual intercourse; the elder daughter visits the elder son while the younger one visits the younger son of the man in their respective house.
And these their brothers also were corrupt in that they did not reject the advance of their sisters.
As time goes on the two daughters got pregnant.
When their family got to know about all that had been going on that brought about the pregnancy the father busted out in tears, regretting his whole life.
It was then that he revealed the secret he was keeping to himself all along. That he was a womanizer, and that it was in a brothel that he met the woman whom he brought in as his second wife.
Now, his sons have taken of his womanizing blood, and his daughters took of their mother's harlotry blood.
This, he says, is a lesson for all men to learn from, that their family may not be ruined like his own.