I take it the tree did not tear open your house? And your house was not vacant. At least on the surface I don't see much to interpret about your dream--since it was clearly predictive--and 1 hour in advance is not an impossible amount of time for the human psyche to experience a catastrophic event. I knew two students at my university WELL who experienced elements of the World Trade Center attack a few WEEKS in advance; I dreamt the onset of my own two-decade-long dangerous heart condition 3 days in advance--etc.
What interests me is why the dream presented your house as vacant: How did you know it was "vacant?" Were there any sense-images involved? Or was it just "knowing" like an already known fact? Where was the upstairs bedroom and the torn open area in your dream house compared to the position of the tree that actually did fall 1 hr later vis-a-vis the house in which you were sleeping in the living room?
The only idea about this difference between your dream and your reality I can hatch without getting more details from you is this: Your "vacant house" may represent the impact on your personality-&-sense of existing-in-your-home-space as a combination of both the building AND its surrounding environment. So the falling tree was effectively wounding the dream-image of your whole-personality-in-its-environs, since this is often what "my house" in a dream symbolizes--since the close-in outside environs are NOT structured with furniture, so they are "vacant."
An event like that serves to show us that dream-time is something beyond linear time. I'd take the assumption that there IS symbolic meaning in WHERE the dream-tree exposed your grandmother's house (since that's NOT what happened in real life). What is the significance of THAT upstairs bedroom? And could you SEE anything in particular as a result of the treefallo? Were you aware that the house was vacant in the dream?
I have to sleep--rough weekend, but I'll do more tomorrow, esp if you write back about how that part of that house is distinguished from all the rest of it.--since it could represdent your grandmother's own personality in relation to her outward contacts or environs.
As I wrote before, that's just to show you that this dream is important enough to transcend ordinary time. It's too late for me to write more tonight. Because I have to take my daughter to paindoc tomorrow early. Your associations to being a child and apprehensive about your uncle who came there highlights the point of contact. Perhaps the opening is either depotentiating your trepidation about your uncle, or inviting you to explore and dissipate your fears about any secrets that might be there. Any further comments would be welcomed--you're suggesting this dream might be contributing to your grieving process.
Normally I ask about the dream trigger(s) and the biggest SURPRISE OR SHOCK. You've answered the second question--but could there also be a triggering thought or event that's recently before instead of an hour AFTER the dream? Something related to the Uncle or MF relationships, assuming Customer means you're female. Your codename suggests you cherish your childhood attention within your family; is that so?
Does your grandmother's central authority ion family acres support that 2adorable self-image? Was the Uncle related to that personality-characteristic or not?