Due to Sagar's over-reaction, Sindura has become suspicious. I believe SV need to confide in Chinu ASAP.
- Sindura might want to check about Sagar's actual (fake?) madness by taking him to the doctors. This is a huge possibility. She did the same for Vidya during her fake pregnancy. Now Chinu can be of help here. Sagar may start crying about his fear about the doctor. He may state he will go if and only if Chinu is the one taking him! They can go and have coffee and forge a bunch of prescriptions to convince Sin!
- Vidya can't be staying guard all the time when Sagar is in Sin's room, searching for papers. Sindura would immediately understand if Vidya breaks two vases in a row to alart Sagar!! Chinu could share V's burden!!
- Chinu can talk in the family gathering about S's condition and there by cementing the idea in Sin's head that S is really pagal.
- SM has great faith in Chinu. Even though SM's character seems benign, she still is the senior most member in the family. They way she confronted Sindura about Vidya staying in the house, means that she does have some say. If Sindura wants to impose something on Sagar, like sending him to special hospital, or special doctor, Chinu can convince SM and she can confront Sindura. It might be hard for Vidya or Sagar to convince SM without blowing up their cover.
- Chinu can cover up SV's trails when they are doing bondgiri and also an extra pair of eyes on Sindura 24/7 wouldn't hurt!