You said that if you look for an authoritative appraisal, it may not be absolute. There is no final conclusion about supernatural things and metaphysics, and there is still controversy in academic circles. For the time being, it is better to believe what it has than not to believe what it has.
According to theory; The geomantic omen of your grandparents' graves is related to your father's generation and has an influence on you. It is directly related to your mother's grave feng shui. If you are lucky, it is more realistic to move your mother's grave.