ДНК S09E87 - Выпуск 1278. Родные, но двоюродные?

At first, she grew up in an orphanage, then she was taken to a foster family, and then she was sent back to an orphanage... The woman only met her biological mother and sisters 7 years ago, but she only got along with one of her sisters. Now they want to find out if they have the same father, as their mother cheated on her husband with his brother. Could it be that they are sisters by their mother but cousins by their father?