There is more to the story about the UCG member looking for his grandfather, George Warner of Paradise, CA. See this story: A desperate search and an impossible Camp Fire escape: One family's fight to reunite
George was a former employee in Pasadena years ago and wrote a book about his life that was published in 2013. It is a fascinating read on the adventuresome life of George.
He starts off rather quickly in his book describing his days in The Cult: The Worldwide Church of God and Ambassador College.
You can read parts of his story about life in the Worldwide Church of God at this link: