Then let him compare Laali and Shekhar, and he will find that Laali will only have boys, and someday down the line even triplet boys.
After hearing that Sid's chart is clearly showing barrenness, Shekhar can suggest going to the ob/gyn once more for a 2nd sono. "Kya bigar jaega Babuji?" Loha agrees. "Chal Chutki."
This time Nandini will go in with Sid.
And you can guess the rest.