Why do this family always let Nisha get the better of them??

I don't know why, but Nisha always wins over everyone regardless!! I don't know why, OK she killed Jhanvi-Aditya yet everybody lets her do and chat shit!! Nobody cares to even SLAP her like she deserves!! Honestly, they should kick her out on the spot!! And why is Samar allowed in when he killed Aditya!! Seriously, the latest episode was pure torture when Jhanvi-Aditya were acting very dumb, I have to say