At the risk of a plot spoiler, there is sort of no punch line or expose to this reunion. Brother is about as loopy as any born-again Christian, and sister is a bit annoying in trying to bait her brother into a debate, but ultimately they both accept each other, and there is nothing to suggest any improper activity or compulsion at work on the commune. Where the film is interesting is as a positive role model for how real people at opposite ends of the current culture wars can hang together in peace.
Its hard to know how to rate a personal film with minimal production values that you watch on the web. Are we comparing it to Casablanca? Or to home movies on YouTube? I will say that it is interesting and worthwhile.