I’ve been looking into near death experiences and stuff for a few months now, as a branch off from my interest in trying to get a satisfactory understanding of what consciousness is for myself, and then from NDE’s it lead into yet other things.. annnd, I’d say yes at believing them.
Unlike the posters above, I haven’t seen ghosts myself, but I know my best friend has been bothered by the spirit of her great grandmother, and I’m pretty convinced by certain paranormal experiences some people have reported. Altogether, I’d say it’s very probable there is something about, and also to not be alarmed by it. Children tend to be more attuned to it for some reason… maybe because they haven’t been too caught up in life and are more “open”. For further consideration, here’s another somewhat related (and more extreme I’d say :D) phenomenon involving children if you want http://www.youtube.com/watch?v=cdmMEKPFDTY
I’m not 100% on this, but there’s a chance their grandfather didn’t go into the tunnel. Or maybe he wasn’t convinced he was dead, or is too caught up in the material world to pass on… I don’t claim to be an expert, but it sounds like the people that have posted already might have an idea :D