ДНК S07E99 - Выпуск 972. Подарили на свадьбу родную сестру

Alexander grew up with guardians and knows that his biological mother's name is Galina Tadra. Oksana grew up with other guardians, but the woman who gave birth to her is also called Galina Tadra. At the same time, Galina Tadra herself assures that she gave birth only once, and her long—awaited son is 13-year-old Danila. Are Alexander and Oksana just namesakes? Or are they siblings after all?