Well last year in july I was going to dehradun via delhi from ahmedabad along with my family. At the airport it came to our notice that my aumt had forgotten her i.d.
We entered the airport with only my uncle showing his i.d and security let us through as we were all on same ticket. We managed the same at dehradun while returning as well and at delhi both the times. In fact none of us were asked i.d. It depends completely on the security personnel. Also we didnt face any issues while checkin. We were flying with spicejet on all the sectors.