It is believed that a person's nature does not change.
For all the goody goody surroundings in the house, it is still true that Chote Thakur was ready to put the poison in RatanSa's food because he was jealous of him.
He is not as smart as his wife (or not even as much as his stupid son and dauther-in-law), but his greed is still present. People do not change and today a small scene showed that the greed for money and power, which was a reason for lot of hatred towards Ratan is still a predominant factor in the family.
At this point a lot of his family members are happy because they think Diya is leaving and Ratan being the trusting a bit naive soul, they will have an upper hand.
This changed dynamics is creating this feel good atmosphere in the haveli. The moment this changes, the reactions of the people will be back to square one.