If you can't determine your grandfather's place of residence, follow your father's place of origin; If you can't determine the father's birthplace, register the birthplace. If the father is a foreigner or the father's information is not recorded in the birth medical certificate, the mother's native place shall prevail. If the place of birth of the abandoned baby is unknown, it shall be registered by the county-level administrative division where the adopter was born or where the adoption agency is located. The name of the country registered by foreigners who have been approved to become citizens of People's Republic of China (PRC) before naturalization.
Change of native place:
If my actual native place is inconsistent with my household registration, my native place administrative division is adjusted or my name is changed, and I am adopted with my adoptive father's native place, I can apply to the public security department for registration of change of my native place.
Reference to the above content: Baidu Encyclopedia-Native place