Can you dig up an existing grave in order to bury another dead person or do you need to take permission of the heirs of the existing dead person's grave?
Even if the heirs allow, it is not permissible to dig an existing grave to bury another dead body if the previous dead body still exists in the grave. If the previous dead body has completely decayed and became soil, then it will be permissible to bury another dead body in the grave which has no remaining. In such case, if the land of the grave was purchased by the heirs, their permission is must to bury another dead body in that empty grave.
'Wassalam.
Wassalam.