Who is not good for when the parents' grave collapses?

It may be bad for future generations.

There is a folk saying that "the grave collapses and the descendants are sparse, and there is no grass on the grave." The quality of graves will affect future generations.

If the tomb does not have the shape of a hill, or there are holes, it will make future generations scarce.

Of course, it is not absolute. This is just a geomantic statement. Believe it or not.