WAS THIS MY GRANDAD?

I was asleep the night my Grandad had passed over. For some reason I woke during the night and was looking toward the window. There was a gap in the curtain and I saw a 'bright white camera flash' go off just outside the window in the gap !! I sat up and said "BOB! did you see that?" Funny thing is that is not my husbands name, it is my uncle's name who was my Grandad's only biological child.
My theory is that my Grandad was talking to me (and I couldn't hear him) telling me to tell my uncle that he was okay, because my uncle was very upset.