A remarkable situation has come to light involving three individuals who discovered they shared the same father. This revelation occurred after they had each turned 20 years old. The circumstances surrounding their birth are linked to the lack of strict regulation of sperm donation in the UK prior to 1991.

At that time, there was a lack of transparency regarding the identity of donors. Further details about this unusual case can be found in La Opinión, which reports on the story of these three individuals who have been referred to as "hermanas de esperma", or sperm sisters.