"The Afterlife of Billy Fingers" was an intriguing book based on a true story. When his brother Billy died, her brother communicated with her.
What made the book interesting wasn't the how since she learned that she was a medium. Instead, I was reeled in by the stories of afterlife. What happens next, was there a tunnel, what does the other side look like?
I think it's love that binds us all. I don't think anyone can communicate to their loved ones and hear back responses like the one in the book. But like your example, they listen and are present...
They're in the wind blowing the leaves, the spark of insight, that sudden feeling of warmth and guidance. They are still co-existing with us spiritually, like we all are. They never really have stopped existing, they just transformed.