Death certificate?
So this family actually let Xiaosi take the place of their youngest daughter, living in their home for fourteen years?
As for hastily returning to the countryside, if they didn't go back, would they just wait to be exposed?
It's not just about not recognizing a three-year-old, even a one-year-old might not be recognized by unfamiliar people right away, but how could the upstairs, downstairs, and opposite neighbors not know?
Moreover, their family used every connection at that time, with newspapers and television broadcasting missing person notices everywhere. Aside from the countryside, people in the city could have seen it more or less.
Therefore, the detective deduced that they must have intentionally hidden Xiaosi at that time.
Damn it!