"One of these is for your parents. You can keep one copy for yourselves. The other is for me to hand it over to the county office and be stored in the archive. This means that if anything happens in the future, it won't be settled according to emotions. When that time comes, things will be black or white. It's still not too late to regret now. After you put your fingerprints on it, you won't be able to change it anymore."
As Old Master Li wrote, he explained the effect of the letter thoroughly. He was afraid that the two sides would not understand what it meant. He made things clear and made sure both sides considered it carefully before making a decision.
Otherwise, once the papers are submitted, they wouldn't be able to reverse the effects easily.
During this time, no one spoke. They all seemed to tacitly approve of this handling.