I don't even know how the doctor was able to say Sona cannot conceive when she is not even married and haven't tried to get pregnant😆. It is impossible to say that unless there is no uterus and other glands and tubes. But since he used the term inhospitable uterus that is not the case.The cause of inhospitable uterus varies. But all these conditions have treatments and the success rate varies from person to person.
Now if Sona is really having infertility issues she is the one who should be made aware of it first. The decision to inform the parents and in laws is very very personal. It is not Ishwari's or Sona's parents right but Sona and Dev's right to decide whether or not to tell and when to tell them.Ishwari deserving to know since it is Dev's 'waris'- we don't know yet if Dev have any issues until he also tries. If he doesn't have any problems they can still get their waris. Medical science is advanced now. Lot of options are there.