Mama ji always supported him in all the decisions !!
i think even in this relation he will support Dev's decision for that first i think he will have a confrontation regarding the same with dev and tell him that even ishwari has a doubt regarding Dev and Sona relation and tells him how ishwari is feeling then i think Dev will take stand to tell about his relation to ishwari.
But i want Mamaji to be with dev while Dev tells about His relation to ishwari