Brandon, I can only tell you what I experienced with my 14 year old daughter. (I was so nieve and not thinking clear. Never did I think that my ex-husband and others were filling my daughters head with crap, not until it was to late)
Her father would pick her up for his weekends and give her articles to read, trying to convince her how 'bad' her mother was for not going to the meetings anymore.
He had elders talk to her.
Had a sister from his hall have a bible study with her.
Showed her pictures with scare tactics of Armagedon and if she stays with me, she will be the one who will die at Armagedon.
Over a 2 year period, by daughter gave in. Now I have lost her completely.
You know the Grandfather more than anyone on this post. (I am sure that he is a very nice Grandfather) But please ask yourself, 'Would he/grandmother or other(s) in the KH try to convince your son of thoughts that his FATHER OR MOTHER were 'bad' for not going to the meetings? Or give him articles to read? Show him pictures of Armagedon to scare him? Over a period of visits would he give in?"
Please be careful
Dee