35 And all his sons and all his daughters rose up to comfort him; but he refused to be comforted; and he said, For I will go down into the grave unto my son mourning. Thus his father wept for him.
I understand your point. However, sheol is the realm of death. It seems as his family is trying to comfort him in the death of his son and he is refusing to be comforted but says I will morn until I am put into the grave, as there is no mourning for the saint after death. However, your interpretation would indicated there is conscious mourning in sheol for the saint. Sheol was the realm of death and his son's body was dead whether it was under ground, above ground, in the sea or cremated or in the belly of animals. Its grave would not necessarily have to be earth, wood, sea, or etc.