The 'New Eden Cult' is likely a specific cult case. However, without more context, it's hard to detail the exact true story. Generally, cults often involve a charismatic leader who manipulates members, isolates them from society, and enforces strange beliefs or practices.
A true story about a cult might focus on how it was formed, the leader's influence, the control exerted over members, and the eventual downfall or exposure. Also, it could explore the psychological and social factors that led people to join and stay.
Well, since I don't know the exact details of the 'Sunny Family cult true story', I can only speak in general terms about cults. Most cults create an environment of fear and dependency. They might claim to have the only truth or a special way to salvation. In the case of this 'Sunny Family', if it is a cult, it could have started with someone who had a persuasive but wrong ideology. They may have lured people in with false promises of a better life, spiritual enlightenment or some other alluring concepts. But in reality, they would have been trapping people in a web of control and abuse, which is sadly a common pattern among cults.
One cult true story is about the People's Temple led by Jim Jones. He convinced his followers to move to Guyana, where he eventually led them in a mass suicide in 1978. It was a tragic event that showed the extreme and dangerous influence a cult leader can have on his followers.
One main theme is likely to be survival. The daughters had to survive in a very oppressive and often dangerous cult environment. Another theme could be identity. They would have to rediscover their true identities outside of the cult's imposed identities.