It's good your wife's grandfather has a positive outlook regarding death.
The JW's view is different in 2 ways imo: first they are in denial about death itself. Being exposed all their lives to 'Armaggedon being just around the corner', they're not emotionally prepared to deal with this reality of life. Commenting on dead loved ones they say "we always hoped to make it together to the new system".
Secondly because they focus so much on works, (what they've done, what they shouldn't have done), they wonder whether they'll be worthy of the resurrection.