What is a former residence immigrant?

"Ask me where my ancestors are, the locust tree in Hong Tong, Shaanxi Province, and what's the name of my ancestors' former residence? Old storks nest under the big locust tree. "Hong Tong Sophora japonica is a famous site of the Ming Dynasty, and it is a holy place for hundreds of millions of descendants of Sophora japonica at home and abroad to seek roots and worship their ancestors. For centuries, the ancient pagoda has been regarded as "home", "ancestor" and "root" and has become the hometown in the minds of hundreds of millions of people.