Do you all remember THIS case from Germany?
http://www.bbc.co.uk/news/world-europe-17690997
Granted, they knew they were siblings, but still "fell in love" and started having kids together. Two of their four children have disabilities.
Here's a case in South Africa:
http://www.dailymail.co.uk/news/article-...dding.html
An engaged couple who dated for five years have been left in turmoil after their families met and they discovered they were brother and sister. The woman, who is due to give birth next month, is devastated by the discovery that the father of her child is her brother. The couple, who met at university, had decided they wanted to introduce their single parent families to each other before they got married. But at the meeting it emerged they were brother and sister who had been separated as small children. 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. It reported: 'Their parents separated when the woman was eight months old and the man was two years old.
'The man's father said he dumped his wife in 1983 because she was cheating on him. The girl was raised by her mother, while her brother was raised by his father. 'Neither of them knew they had a sibling.'
Here's yet another case out of Ireland:
http://www.dailymail.co.uk/news/article-...ister.html
A young couple have revealed how they fell in love after meeting at a nightclub, moved in together, had a child – and then discovered they were, in fact, half-brother and sister.
The extraordinary discovery was confirmed by DNA testing just last month. It has left the couple stunned and shaken – but they are nonetheless vowing to stay together and have more children.
They both blame the legal system which prevented the young man from being told his true identity. He only discovered who he really was long after he and his half-sister had got together and had the child.
So you see, don't be so quick to think this story is nonsense. There are a lot of different circumstances that lead to this happening...