A woman of 7 years is raising a daughter, although she is sure that she gave birth to a son. She was repeatedly told the sex of the child on ultrasound, and most importantly, the tags from the hospital indicated that a boy was born. The mother immediately rushed to the maternity hospital with a demand to exchange someone else's girl for her own son, but she was refused. While the blue-eyed dad and mom have a brown-eyed daughter growing up, the grandmother has found her own explanation for this. On whose side will the genetic examination be and what will it prove — substitution of a child, treason or consanguinity?

Tambov grandfather demanded a DNA test for five grandchildren from his own son. At stake is the inheritance of two houses and the honor of the mother of five children. Are the grandchildren of the grandfather not relatives? Who will become a father after the announcement of the results of the genetic examination?