Time travel is very confusing isn’t it? Especially when you time travel backwards and change things.
So, look, here’s the dilemma. Supposing in 2012 I took a photo of a building. Then in 2013, I got married inside that building, which just happened to be a Registry Office. In 2014 (what you might call ‘now’) I travelled back in time to 2011 and blew up the building.
With the plot so far?
When I left in 2014 to travel back to 2011, my loving wife was holding and watching closely the photo I took in 2012.
In other words, I went back to the year before the photo was taken, and I destroyed the building.
Now, the questions: Firstly, the photo. Would it suddenly change when I destroyed the building?
Secondly, would my wife, who I’d left staring at the photo, realise it had changed?
And, for that matter, considering I was destroying the building two years before we were married within it, would she still actually be my wife when I returned to 2014?
England's England 
Haven’t you done this before – well very similar anyway? From the moment you had blown up the building, you had changed history , and so created an alternative time line. The photograph would cease to exist , and your wife that was holding it would have no recollection of it ever having existed. You would not be married because the wedding never took place and your wife – that was- would suddenly have no recollection of it ever having taken place, even though she had not been anywhere since she previously had knowledge of the wedding. Because this happens in a split second , the shock to your wife , suddenly having her history changed would likely cause here to black out and collapse for a while , and she would be horribly confused when she came round.
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