ДНК S04E126 - Выпуск 530. Чужая среди своих?

The sisters are waiting with horror for the result of the genetic examination, because their mother admitted that someone else's child was brought to her for feeding. Mom is no longer alive, and that same daughter still can't calm down and wants to know the truth about her birth. The other sisters don't believe in substitution. So is the woman related by blood or a stranger in her family?