How does one reinstate their “living” status if they were wrongfully declared dead?

This is a serious question.

I know this happens on occasion, and I am wondering what steps one would have to take to prove to the government that they are not deceased. Does anyone here actually know?

I know it is rare and unlikely, but I am in the somewhat unique position of having to recognize that this may be a possibility I would have to deal with when my mother dies.

General question.

Thanks.