This should happen

Soon, Kaushalya nivas is gonna go out of the Sharma hands-- Vinu is a useless beta , only dialogues, not really done anything for his parents, so mamaji and mamiji will have no house to stay in because of their "apna" beta Vinu.

Meanwhile, Sadhna will do well in her career, although mallika is rude to her, I have a feeling, Mallika has identified Sadhana as an intelligent and capable girl who can do anything when the need arises, so, Sadhana will get promoted and Mallika will give her bangla and gadi. So, then, we will have mamaji and mamiji moving in with her to the new house after the Kaushalya nivas confusion. So, Kaushi who has always treated Sadhna as "parayi" will be dependent on her. Kaushi thinks that she has done an ehsaan on Sadhna by keeping her in her house from when she was small, so, now, Kaushi should feel ashamed of herself to come and stay in Sadhna's house. Kaushi will be reluctant, but mamaji would not mind moving in with Sadhana because he treats her like daughter, but Kaushi will feel uncomfortable but left with no choice.