To dream that you are at a grave indicates that you need to delve into your own subconscious in search of an issue that you thought had been put to rest. You need to stand up for yourself for no one else can do it for you. Alternatively, it represents something is about to be completed in your life. You are leaving behind the old and making a new start. The dream may also be a pun on feeling grave or concerns about a serious or sad situation.
To dream that you are digging a grave denotes some nervousness and uneasiness over some undertaking.
To dream that your dead uncle calls to tell you that he is digging graves indicates that your subconscious is telling you about some hidden truth or family secret that needs to be uncovered.