I spent a lot of time with an elder brother before he passed away and I could hear him talking to deceased relatives, both recent and long ago. At first, I attributed this to the drugs he was on for pain. However, as death drew nearer, he asked that the drugs be stopped so he could speak with his family coherently. Even then, these experiences continued. I did a lot of reading on the subject, including a book which actually was able to calculate the weight of a soul at about 1/8th of an ounce by measuring the loss of body weight at the time of death and adjusting for air in the lungs, etc.
I came away convinced that all people have souls and possibly even do some animals.
After C.S. Lewis’ death, an acquaintance of his said that he appeared in a leather chair in his office and said one thing:
“It’s not that hard.”
Again, make of it what you will...