ДНК S06E100 - Выпуск 817. Вместо санатория в детдом?

Mom promised to take her daughters to a sanatorium, but she took them to an orphanage. Now the sisters intend to find out who their dad is, because there is a dash in the "father" column. The former lover of the mother admitted that the girls could be both his daughters and nieces, because the woman met with two brothers at once. So which of the brothers is the father, and who is the uncle?