I was raised in the Jehovah's witness religion. My mother joined because she wanted to be young forever. They told her she would never go old and die. She would be able to see her family that had died. My sisters and I were told we would never have to worry about graduating school, getting a job or getting married because God's new order would come and we would live on a paradise earth.
They said that 1975 would see that promise come true.
I am 63 and my mother is 83 now. My mother still believes that she will get to paradise - except she knows she will die - since they have changed their story, she has gone thru a terrible depression.
I know now, that this religion like many others, makes their living promising a future that is always in the distance but never realized.
I'm sorry about your Grandfather. I miss my Grandma too.