This Couple Welcomes Twins, But One Looks NOTHING Like The Father. This Is Actually INSANE! After getting a DNA test, a man in Vietnam learned something shocking. His wife had given birth to twins, but the doctors announced to him that he was only biological father to one of the two children! How can this be? In an extremely rare medical case called bi-paternal twins, a professor from the lab in Hanoi announced that a woman had given birth to a pair of twins, and each one had a different father. So while they shared a womb together, the twins were only half-siblings, genetically. The test was taken when the parents of the twins could no longer deny the major difference in their appearances. The president of the Genetic Association of Vietnam, Le Dinh Luong, said: This is rare not only for Vietnam, but for the world. The medical phenomenon occurs only in fraternal twins in which two eggs from the same mother are fertilized by two different men in the same ovulation period. After many of his family members pointed out that one of the twins looked nothing like him, (one had thick, wavy hair, while the other had soft and straight hair) he decided to have them genetically tested. 