I want to move my mother's grave in a few days. Please tell me the matters needing attention. Thank you very much Urgent! ! !

Said not only to remove the bone, but also to remove the coffin under eight inches of land. I don't think my mother's coffin will rot completely for ten years. Should I take my mother's old coffin with me? Please give me some advice. Thank you very much This is a very serious question, not a very understanding friend, not a sincere friend.