private grave

Burying the deceased in a land without the permission of the owner

Q: A close relative passed away about six weeks ago. He was buried in a grave allocated by the burial service and administrators of the grave yard. I was recently approached by a friend and was told that it was a private grave which was paid for by their family and I was asked if it was possible to move the marhooms body to another grave. I find this very difficult. Please advise urgently.