Sadaf really tried to act like a doormat wife with an unknown person. This time Shehroz was not wrong to show her right place. I guess nothing matters to her family except money, they wouldn't think twice throwing their daughter at door of rich man to impress him by taking all insults, and they will not give any respect to poor, not even when they share blood relation. Mother-daughter are acting like Shehroz is last living rich man on this planet, rest all have died, so it's important to take all his shit with smiling face. No doubt her cousin managed to trick her for long with fake marriage promise, sadaf is a dumb chick who is privileged enough to get good education and career, but she can't think beyond getting married with a rich man and become a doormat wife.
The problems with entire family is that they don't care about the word 'concent'. Sufiyan would go around making scene for Ushna and declaring his one sided love when she had clearly said 'no'. Husband- wife know that widow sister is not mentally ready for marriage just few month after husband's death, but they would force her to an extent where marriage was important just for survival. And now daughter is forcing herself on a man just because he has money.
This Ushna's adoption twist was brought to make a way for Ushna-Shehroz and not make them step siblings.