Mr. Sachin,
I don't know who you are and how intellectual you are, but I would advise two things to you:
1. Don't judge anything without knowing the whole story
2. Make it a habit to read and read again to confirm your first understanding of the matter, else join english improvement classes
Because, one you don't know the background and two, you have misinterpreted my question. We are not trying to change/remove father's name. We just want to confirm if my sister's marital last name in my niece's birth certificate needs to be changed because her (my sister's) last name has been changed in all her legal documents like Aadhar card, Passport, etc.
Let my try to explain with an example - suppose my sister's name before marriage was Sita Dyal; after marriage it became Sita Khosla; when my niece was born her birth was registered and in the certificate my sister's name is Sita Khosla. Then she got divorced and all her legal documents changed back to Sita Dyal. In this case, should we change her name in my niece's birth certificate also?
I hope this time it's more clear.