What do "Dr" Shantharaj Redson and "Dr" Sunil Redson want?

Why do "Dr" Shantharaj Redson and "Dr" Sunil Redson want to Threaten Roshni Mathan after claiming the R.M.P licence has been given by Dr J A Mathan? We will murder you, the way we have murdered your Father, and make it look like an accident! The Mobile call records "How...