I have come to the conclusion that nothing is going to shake my family member's faith in the WTS....UNTIL he starts to doubt & question the Organization ON HIS OWN.
Unfortunately for those of us who would prefer to see our loved ones free of this controlling cult, what you said here does seem to be a fact. And maybe he's not a fool so much as in need of something that association with the JWs and the WTS can seemingly provide him--many intelligent people are taken in by cults like this because they want or even need something to believe in to make their lives meaningful and livable. So don't write him off as a fool, but stand ready to discuss his doubts and issues with the WTS-- at his own pace--when they start to surface. Meanwhile, you have the opportunity to prove to him that "worldly" people's love is not conditional, unlike the JWs'.