hi.
one of my favourite sayings,"not until a bond is broken,is the bond truly felt"
I think this is relevant to your dream,
you are re-visiting the scene of some aspect of your past,especially as you were heading downwards,
perhaps to find some sort of closure or emotional release,may be about your grand dad,
if it is about release of emotions surrounding that time in your life albeit repressed emotions ,then the dream has done its job,by taking you back ,the people that you did not like & didn't know why they were there ,may be metaphors for the unconscious blockages put in place to conceal your pain,
to some ,what lies beyond death is pure conjecture,i don't know your beliefs but the dream would seem to reflect a truth,that at the very least your grand dad is really happy & ok,that may be his gift to you.
I may be totally off the mark ,but I hope something I have said is of use to you.
regards mikey