Here are a couple of other ideas on this subject:
The best chance of reaching a loved one that is in a cult is simply respectful, heartfelt communication. Unfortunately there is no “magic-bullet” or one approach that always works.
As counseling psychologist Michael D. Langone, PhD, the Executive Director of the ICSA, explains, the best approach is the “patient, persistent communication of that which ultimately shatters all walls: truth, honesty, respect and love” (Giambalvo, 5).
Here also is an anecdotal account of what worked for one former JW cult member and how her husband helped her learn TTATT:
Do not use or share any “apostate” material (study it before for topics and ideas, but do not directly mention or reference)
Never criticized or put down the organization, GB, elders, etc. Very important since one is so sensitive to that subject when you believe they are directed by Jehovah.
Never, ever discuss doctrine
Never disrespected the JW’s beliefs.
Share doubts, but do so in a humble, non-confrontation manner. Don’t assert definite answers or proof: “I researched this and found out it's not the truth because ... blah blah blah. …”
Use lots of questions and try to let your relative/loved one think for themselves.