Life doesn't always make things easy. I had close friends who lost their younger boys first, in his early twenties, and then their older son a couple of years later. It's never easy.
Danny's mother heard about Cole and Graham's mother having some success, so she thought she'd give it a try as well. If you remember, it's was Danny's father who wanted Danny gone, not her.
I know that there are claims of temperature drops with spirits around and the strange sensations involved when passing through a spirit, but I've avoided getting into that in the story. I decided to focus on what the evil spirits do and that the good spirits are there looking over them.