They are still outsiders.. She is the mom... She should have shut them up asap when they mentioned that bachchon ke baap wala rishta... A mom is supposed to be protective of her children..
I think the mom is responsible for the elder sister being married to that greedy man.. Jo bhi pehla rishta aaya hoga ussi se kar diya bina soche samjhe...
I think the mom was financially dependent on the Chacha until Mehru started working, and I think he kept rubbing it in so she felt obliged to him. It's a horrible feeling. The elder sister absolutely got married to the first man who came with a proposal.
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