I don't believe in any ghost around here because it's a gang turf, it's supposed to be mucky, I would be happy to see any evidence, I have some here, these are things that can't lead us to anything of course, but here they are:

Owner's portrait:

I found this portrait, teared apart, you can clearly see two love birds with eachother, it seems that 

they are being tormented or it's just a portrait. It's likely that the gang tore it, there's no arguing in that. 

REBEL:

I found these words written in and out of the mansion, now these words could mean two facts:

1)It is related to the gang, as it means rise in opposition of government or armed forces

2) It means to rise against resistance, it's a term commonly

 used in love stories, it is possible that the owners rose against some sort of opposition to defend their love?

Blood Sheets?: Nothing much to add here, but these could be old blood sheets that stained the couch? 

The Ghost Reference?: This is the most interesting one, I have circled the object

which seems like a ghost, anyways, it's all known to this day.