If you're interested in helping your loved one see through the lies and manipulation of the Watchtower, I would highly recommend Steven Hassan's book, "Releasing the Bonds: Empowering People to Think for Themselves." He emphasizes building rapport and trust with cult members before criticizing the cult.
He tells the story of a woman who tried to get her JW husband to leave the organization by pointing out all it's problems. Unfortunately, her plan backfired and it took a toll on her marriage instead. The book has a well thought out plan to help cult members get out without damaging relationships in the process. I really liked it.