I am from india.why old people in their last stage of death speak of their encounter with the dead - usually with their parents?near death experience?

Unclear: There are many reports that are all generally similar about near death experiences, read "Proof of Heaven" which is written by a neurosurgeon. There are some chemical reactions that occur with death that some say explain the visual reports . But the more we know the more we know we don't know . It makes sense that those important people might be near in "the last stage of death"