in addition, a tear had rolled down her eye on hearing from Diya's father that Mann would have been alive if he had been safe among his family members...
I believe she is being framed... kill Mann's family and frame the next in line, that is, Choti Thakrani sa coz the real villain is aware of her strong hold in the family and over Ratan...
I believe the real villain is the Bua... her son may not be involved in the conspiracy, but feel he may have a soft corner for Yash's mom (the Bhabhi of Ratan)...