They had their own doubt because from childhood, for the reason of safety she rarely went out other than Kapoor's house she didn't go out much n if Saira was poisoned then there are only two places and both are under the name of Kapoor's, one is Kapoor's house and another one is Kapoor's hospital where she was treated and vaccines before.
When Shanaya confirmed their doubt other than anger and fury they didn't feel much of surprise because Kapoor's were primary suspect and Shanaya was the one who they doubted most when Shanaya said, Saira was poisoned but they didn't want Hrudan's hands to have filthy blood of someone they hate and despise and now it isn't ancient time where they can kill but not sentenced for the killing but today's world everything is under the law even prime minister have to bow his head in front of the law and for that, they didn't want their Hrudan to be the murderer.
