You might also try thinking about what the house represents. Could it be there was something left undone with the grandparents who lived there? Or is it a more metaphorical 'house' that you have to search to find what you need? Perhaps it is not what's in the house but what isn't there that's the important factor.

I had a recurring dream about a house, too. Almost the same scenario as yours, except something awful happened to me in that house years ago and I am terrified as I wander through the rooms. I stop at a doorway and watch as the door opens, knowing something horrible is about to come out of it, and I'm going to have to face it again. I don't really have much trouble deciphering that one!

My other recurring dream is about being chased by the Terminator. Seems my subconscious is not big on subtlety.

and no one ever dreams of me.