Given the ever more complex family (and non-family) arrangements, you\’d think that things like this would happen more often:
Twins who were separated at birth have married each other, unaware that they were brother and sister.
Each had been adopted by a different family, with neither being told they had a twin.
We do tend to be physically attracted to those we are genetically close to. The reason we\’re not all hillbillies (the old joke is that a hillbilly virgin is one who can run faster than her brothers) is that there seems to be a mechanism whereby those who actually grow up together switch off that physical attraction bit (there are various thoughts about how this actually happens).
With the rise of IVF, sperm and egg donation etc, it does actually seem entirely sensible that this bcomes law:
"The right for children to know the identity of their biological parents is a human right.
"There will be more cases like this if children are not given access to the truth. The needs of the child must always be paramount.
"If you start trying to conceal someone\’s identity, sooner or later the truth will out.
"And if you don\’t know you are biologically related someone, you may become attracted to them and tragedies like this may occur."
I\’m not sure about human right, but as a matter of practicality. There\’s already a limit on the number of children a sperm donor (8 I think it is) can sire to reduce the possibility of such things happening.