It’s unlikely one can in 5 minutes undo years of indoctrination.
There is no silver bullet solution…nor is it one size fits all. Some people have gotten lucky and managed to get their family out, but the majority of cases, it’s a disaster. It’s like diffusing a bomb. You have one shot and the bomb can never unexplode
When you are mentally out for a time, or have free discussions on forums like this, or with coworkers, it is easy to forget that you are not talking people who will be reasonable on this matter, but one under undue influence or mind control.
I’ve seen this played out again and again over the last four years. Often the family member will raise the aposta-alarm and call in the elders to help “restore” the person attempting to reason with them. After that, it’s all downhill from there.
Perhaps the best thing would be to watch documentaries with the person about other cults, like Going Clear, Meet the Mormons, and so forth. Then ask questions, like, “How would you reason with such a person? They are utterly convinced they have the truth. What would happen if we are one of them and realized it wasn’t true? Would we stand up for truth if it meant getting cut off from family and friends?”
It’s easier to give this advice, than to heed it though. When dealing with our own loved ones, it’s not easy to have a cool head about the matter. It’s easy to slip up.