score:2
This is writing after the journey.
I had convinced ticket examiner by showing the confirmation message received on my registered mobile number on irctc website after booking both tickets,that message has PNR number and passenger name of the booked ticket so that he wanted to see my identity card only.
Upvote:4
According to Indian Railway rules, one of the passenger booked on an E-ticket in a PNR is required to present the proof of identity while travelling. Since you have booked two separate tickets, each ticket will have its own PNR. So technically, at least one passenger from each PNR should have some document to proof his/her identity.
However in many cases, the ticket checker doesn't check the id-card and if you can convince him/her, you might be able get away with it. Since all seats are in the same coach, it should not be much difficult to convince the ticket checker.
Also note that their might be multiple ticket checkers since Indian railway keeps changing them based on the zones for long distance routes.