I think RB is from any relative of Pratap , Anurag's nana ji .. he highlighted first day about pratap publication where how Molo basu bribed People for the live coverage of death shot ... i think the way moloy took over paratp's company , now same thing he is applying on taking over basus.. who knows , mohini was mohini bajaj ... may be RB is from mohini's maternal close relative ..probably Rb's father is mohini's big brother whose rights had taken over by moloy basu ..which RB's father could not tolerate n RB's full family ruined... i dont think RB is illegitimate son of anyone..