I don't believe in ghosts as we are taught that people are in a different alam after death. That said I don't like seeing ghostly pictures as it bothers my imagination. Haha. I used to explore abandoned hospitals, cemeteries, etc with my friends a few years ago. Cheap thrills..
An aunt of mine was staying over at someone's house and a particular jewelry went missing and the person accused my aunt of stealing it. My aunt was very saddened by the accusation and she told me that that night the mother-in-law of the accuser came to her and "consoled" her telling her not to worry. i'm not sure whether she was referring to it as a dream or not as the memory is quite fuzzy to me. Well anyway it turned out that someone else had stolen the jewelry and pawned it off.
I guess my question is that is it possible for late relatives to "visit" living relatives, any hadith that might be related to it? Also, in the back of my mind I kind of think that it was during Ramadan but I can't say for sure. Just putting it out there in case there is any relation.