When my father in law passed he also called out to his mother. He told us he could hear her calling to him.
One night I was awaked by a dream where some female entity was kicking and pinching me while asking "Why did you divorce my baby?". I gave the answer, and that drean entity chuckled and made a comment about "the old family problem". The next day my ex-wife called to inform me that her grandmother had passed away during the night.
Several years later I had a drean where a strong male entity gave me the same sort of treatment. When I gave the answer he said, "Hmmmm. Just like her mother". The next day my ex-wife called to tell me that her father had passed away during the night.
I have several more interesting incidents like this. There is no doubt that there is a spirit world, and it can indeed interact with our world.