A 25-year-old mother does not know who the father of her newborn son is. At the same time, the woman met both her ex—husband and a new lover, and shortly before the birth of her son, she remarried her ex, so he is the official dad. Only three days after the wedding, she divorced and went to her lover, and he believes that he is her own father. So who is the father of the newborn Matvey?