The results of a DNA analysis, left the lab staff a bit perplexed; they had just finished a on set of twins, including their parents. The results showed the twins to have the same mother, but the paternal alleles corresponded to two different people. One of the first reported cases was described by John Archer, an american physician, in 1810; Archer described the birth of two children by a white woman, who had sex with a white man and a black man within a short span of time; one child was white and the other one of mixed race. So we can see that these events have occurred, and in this case one can tell by the phenotypic traits (color) but in cases of parents of the same race, only analysis of the genotype () can tell us if super fecundation occurred. The analyses were repeated two more times, and the two times showed the same results; aside from women on fertility treatment, where egg production is induced and multiple eggs can be released; normally women release a single egg and it is a rare event that they release more than one egg within the same menstrual cycle, but it does happen, and it is even rarer that two eggs can be fertilized within a 72 hours period. Certainly it was a great surprise and a great embarrassment to this mother to finally admit that at the time she had intimacy with her husband, causing the first fecundation and 2 days later she had intimacy with a second man, whose sperm fertilized the second child. A number of super fecundation cases have now been reported in the literature, around the world and a number of scientific articles have been now published describing them Very frequently our scientists run into these kinds of unexpected results; it is not our job to pass judgment on anyone, only to provide as accurate and trustworthy results as possible; as an AABB accredited lab we follow very strict procedures and protocols to ensure the reliability of our results. can reveal with a high degree of accuracy the paternity or maternity of a given child.