What is the use of L primary school students in Harbin, Heilongjiang, asking for grandparents' ID card information?

This is to register students' native place, and to make student file information and study cards when they graduate.

Don't worry, landlord. I also asked for these things in elementary school. If the landlord is afraid that the school will do bad things maliciously, he will draw a line with a pen, fountain pen or ballpoint pen (not a pencil) on the copy of the ID card. This copy of ID card is limited to the authentication of a certain school and cannot be used for other things.

In this way, the school has done something illegal, and people will know what is going on at a glance, and they will not use a copy of your ID card to do things.