What should be one of the happiest times of their lives has turned into a nightmare for an engaged couple awaiting the birth of their child next month.
They have discovered they are brother and sister.
The couple had dated for five years after meeting at university and wanted their parents to meet before getting married.
"But at the meeting it emerged they were brother and sister who had been separated as small children," Britain's Daily Mail has reported.
"The unnamed South African couple are still in shock after making the discovery last Saturday.
"The country's Sowetan newspaper reported that the siblings had been raised separately after their mother and father went through an acrimonious divorce."
The woman was eight months old and her fiance was two years old when their parents separated.
"The man's father said he dumped his wife in 1983 because she was cheating on him," the Sowetan newspaper reported.
"The girl was raised by her mother, while her brother was raised by his father.
"Neither of them knew they had a sibling."
The Sowetan newspaper reported that the two families did not meet throughout the five-year relationship, until it was time to discuss wedding arrangements.
The woman said it was love at first sight when she met her partner, but their parents' shock announcement had left them devastated and they had decided to separate.
"When I first saw him, we connected. We fell in love and since that day, we never looked back," she told Sowetan.
"All we wanted to do was just to have a family and many kids.
"So you can imagine how shocked we were when they broke the news. We are going to have a child together. We do not know what we will tell him when he grows up."
The Mail reported that research by the British Medical Journal showed that half of those people separated from relatives at a young age experienced strong sexual feelings when they reunited.
"Psychiatrists believe the natural repulsion brothers and sisters feel growing up together as children acts as an inhibitor to incest," The Mail said.
"But those who miss out on this time can develop powerful, obsessive feelings for their sibling in adulthood."
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