How to modify ancestral Mongolian?

First of all, you should understand a concept. Ancestral place refers to your family's original place of residence, not your national nature, but you can confirm that if your grandparents are Mongolian, there is a way to solve it. 1. Find a witness in your grandfather's or grandmother's original place of residence to prove your grandfather's or grandmother's nationality, then organize the certificate locally and change the nationality at the police station. 2. Postpone your father's change of nationality. Of course, you changed it yourself. 4. Then your next generation.