1) Shivam does not want to save his mom by opposing dadi. He basically wants Riya to take place of his Mom as Dadi's Slave so by default his mom becomes free.
He sees nothing wrong per say with Dadi's attitude as long as it is not directed towards his mom
2) Shiavm-nimmi-preeti think there is nothing wrong with their Dad's attitude with their mom. In fact they want Riya-shivam's relationship to be exactly like their dad and mom. Where the girl puts up with all kinds of shit.
I was shocked, shocked to hear Nimmi's thought about Riya Today. She thought Riya was wrong who was hurting her brother and their family
... So its clear. All 3 of them are exactly like Dadi, Sarla and Raghav. They just want some other girl to become the punching bag of the family.
What a shitty Family