Should my father be told the results of the CT scan of his brain?

In a rather bizarre twist of fate, I was shown my dad's CT scan. It was from June of 2012. The results were shocking. The doctor showing me the scan (in January of 2013) confirmed that dad suffered a severe cerebral hemorrhage. In retrospect, my mom and I were concerned about the changes we saw in my dad but it was all attributed to his Parkinson's and Dementia. I really didn't think he would make it to Christmas.
Actually, my mom didn't know until I told her. She was so surprised as she hadn't even been told that Dad was taken for a CT scan. His short term memory is poor anyway, but neither of them knowing is unsettling to me.