Just after posting the first links below regarding Yeon-jin (Kat) Moon, I came across the following two 2012 articles, which is what I have in mind for this thread. I will be able to in some cases add more details and links.
This first article explores some of the problems and issues some of Moon's children experienced.
Sept. 28, 1998: Do As I Preach, and Not As I Do (https://web.archive.org/web/20111221014352/http://www.time.com/time/world/article/0,8599,2053845,00.html) (Time Magazine/Internet Archive)
Sept. 4, 2012: Rev. Moon Oversaw Large, Often Bickering Brood (https://www.deseret.com/2012/9/4/20433652/rev-moon-oversaw-large-often-bickering-brood/) (Deseret News)
Sept. 5, 2012: Moon & Wife 'True Parents' but Children Suffered Estrangement, Tragedy - & Reality TV (https://www.yahoo.com/news/moon-wife-true-parents-children-suffered-estrangement-tragedy-113715368.html) (Yahoo News)
The True Parents site has a page with short bios for eight of Moon's children. (https://www.tparents.org/Library/Unification/Publications/Smm-Org/family_children.html)
The bio of Hyo-jin Moon has no mention of his first wife, Nan-sook Hong nor their five children from their 15-year marriage. (https://peterdaley.net/strangerthings/index.php?topic=67.0) How Orwellian.
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Mainly for my benefit for now, I just want to list the most notable of Moon's children. In no particular order, except that from what little I know, Kat seems like the most intelligent, articulate, and compassionate - and she wanted nothing to do with her parents"church". We can infer from that that she didn't buy into her parents' messiah claims, the foundation of their cult.
Yeon-jin (Kat) MoonLinks from TParents.org (https://www.tparents.org/Moon-Talks/YeonJinMoon/0-Toc.htm)
Nov. 23, 1999: In Memory of My Brother (Young Jin) (https://www.tparents.org/Moon-Talks/YeonJinMoon/YeonJin-YoungJin.htm)
Note: I just posted below the opening two paragraphs and closing sentences. It is very much worth your time to read it. It provides insights into both Kat and her brother Yeon-jin, who tragically committed suicide on November 2, 1999.
QuoteI was saddened to hear that the only testimonies given at Young oppa's funeral were by people who never took the time to get to know him, i.e. Kim Hyo Nam, Mrs. Lee, and Peter Kim. I want to give you a taste of what my brother was all about. And I never want him to be forgotten...
My brother was someone not many knew. I, however, was lucky enough to spend a significant amount of time with him. He and I attended Groton School, a prep school in Massachusetts, for three years together. He was charismatic and loved by all the faculty. He was especially known for being a hard worker, who ceaselessly worked to attain all his goals. He was quiet and soft-spoken, but when he opened his mouth, only intelligent and bold opinions emerged from his lips. He excelled during his years at Groton, which, I believe, were probably the happiest and most successful five years of his life. ...
I wish the world could have known what a difference he made in my life as well as others. I want everyone to know what a great brother, friend, and mentor he was to me. He was always calm, composed, and extremely logical. He lived for the sake of others, and was truly selfless. He was kind and generous. I love him dearly, and he will always be my favorite brother.
Young-jin MoonFormer member Teddy Hose reflects on his experiences growing up around the Moon family and his memories of Young-jin. Father Moon's responce to Yeong-jin's suicide was one of the factors that led Teddy to leave the cult.
Feb. 8, 2022: Why I Left the Moonies (https://www.facebook.com/watch/?v=696845684643854) (Teddy Hose on Facebook)
Heung-jin Moon (https://en.wikipedia.org/wiki/Heung_Jin_Moon) sadly died at the young age of 17.
Jan. 3, 1984: Moon's Son, 17, Dies After a Car Accident (https://www.nytimes.com/1984/01/03/nyregion/moon-s-son-17-dies-after-a-car-accident.html) (The New York Times)
QuoteOne of the 13 children of the Rev. Sun Myung Moon, the founder of the Unification Church, died early today in a hospital here, a hospital spokesman said.
A son of Mr. Moon - Heung-jin Moon, 17, of Irvington - had been in critical condition at St. Francis Hospital since an accident last month in which a car he was driving collided with a tractor-trailer on State Route 9 in Hyde Park.
And then, according to Moon, his soul returned to earth and into the body of a member from Zimbabwe.
March 29, 1988: Theological Uproar In Unification Church (The Washington Post)
QuoteEvery night last fall, students at the Unification Theological Seminary would gather for the latest revelations from the land of the dead. A senior named Charles was hearing voices -- "channeling," it was called -- and relaying startling messages: Heung-jin Nim Moon, the late son of the Rev. Sun-myung Moon, was speaking from the "spirit world," watching and judging them.
Then last November, the sprawling 230-acre campus in Upstate New York was abuzz. The moment had arrived, seminary officials proclaimed: "Lord" Heung Jin Nim, killed in a 1984 car crash at age 17, had come back, reincarnated in the body of a visiting church member from Zimbabwe.
"About mid-November, I was told there was a black brother from Africa who had been prepared by Jesus . . . and that Heung-jin Nim had assumed his body," said Dick Richard, a former seminary student who recently left the church. "It obviously scared a lot of people there . .. but they went along with the whole thing because it came from Rev.Moon, the Messiah."
Much more here. (https://tragedyofthesixmarys.com/black-heung-jin-moon/) (Tragedy of the Six Maries)
And from the above link, two videos of that Zimbabwean, Cleophas aka "Black Heung-jin Nim", after parting with the Moons. He shares his version of events from 50:00 in the first video and claims it was all Moon's idea and shares knowledge of Moon's many affairs - although given the power differential between a "Messiah" and a young female follower, I don't think "affair" is the right word. And I have no idea of Heung-jin was a violent boy, but there are a lot of accusations that Black Heung-jin was.
Part 1: https://vimeo.com/39941021 (https://vimeo.com/39941021)
Part 2: https://vimeo.com/39949809 (https://vimeo.com/39949809)
Hyung-jin Sean Moon (https://en.wikipedia.org/wiki/Hyung_Jin_Moon) now leads his own splinter group that focuses heavily on guns (https://peterdaley.net/strangerthings/index.php?topic=66.0).
Some of his own reflections on his childhood are included in the following Washington Post and Rolling Stone articles:
May 21, 2018: Locked & Loaded For The Lord (https://www.washingtonpost.com/news/style/wp/2018/05/21/feature/two-sons-of-rev-moon-have-split-from-his-church-and-their-followers-are-armed/) (The Washington Post)
QuoteSean Moon wrote about the downside of their gilded childhoods in a 2005 memoir. "We grew up many times seeing Parents one or two weeks, combined over various visits, out of the year," he recalled. "I many times felt scared, abandoned, and neglected. ... We were surrounded, constantly, by [Church] members. ... I sat and seethed in anger many nights, as I drifted off to sleep."
Aug. 18, 2022: Inside The Bizarre & Dangerous Rod of Iron Ministries (https://web.archive.org/web/20220821071417/https://www.rollingstone.com/politics/politics-features/rod-of-iron-ministry-jan-6-sean-moon-moonie-1398447/) (Rolling Stone Magazine/Internet Archive)
QuoteHe grew up cloistered in his family's 19-acre church compound in Westchester County, outside of New York City. Because of security threats his family faced, Moon recalls in a 2018 book, he was "not permitted to wander the neighborhoods, hang out with friends, or ride our bikes outside." His outlet from bitter isolation — home, he writes, "seemed like a prison" — was self-defense training, including Brazilian Jiu-Jitsu, of which he's now a blackbelt, and, eventually, firearms. ...
He had a compelling reason to go off in search of himself. Sean was in college in October 1999 when his brother Young Jin "Phillip" Moon jumped out the 17th-floor window of a Las Vegas hotel. He was 21, a year older than Sean. They had been inseparable growing up. "For most of our lives we shared the same room, the same video games, and the same Doritos chips," Sean wrote in his memoir.
Kook-jin Justin Moon (https://en.wikipedia.org/wiki/Kook-jin_Moon), the fourth son, is a co-founder of brother Sean's splinter group
Aug. 18, 2022: Inside The Bizarre & Dangerous Rod of Iron Ministries (https://web.archive.org/web/20220821071417/https://www.rollingstone.com/politics/politics-features/rod-of-iron-ministry-jan-6-sean-moon-moonie-1398447/) (Rolling Stone Magazine/Internet Archive)
QuotePolitical extremism is a profitable endeavor, and the greater Moon family is no exception. In Sean Moon's church, guns are holy. But for his brother Justin, they're also business. By crossing the streams of end-times Christianity and Second Amendment fundamentalism, in the swing state of Pennsylvania, Rod Iron Ministries is making itself a powerful draw for MAGA politicians eager to communicate with the most based of the GOP base.
Sean Moon's gun-promoting church, in Newfoundland, Pennsylvania, is closely tied to his brother's gun business, the Kahr Firearms Group, headquartered in nearby Greeley. (Both towns are exurban to Scranton.)
Kahr Arms Groups owns several gun brands including Thompson, and the company makes street-legal Tommy Guns as well as AR-15s. While the NRA touts Kahr as "a Premier NRA Industry Ally," the company actively partners with the even-more-hardcore Gun Owners of America, and fights gun-control legislation in Congress as part of GOA's "No Compromise Alliance."
Sean Moon describes his brother as "a member of our church," adding that "like any other member, he contributes what he feels in his heart ... to the organization." I asked Moon whether adopting the Rod of Iron branding for his church had anything to do with boosting his brother's business. "No," the pastor retorted. "Of course not."
July 22, 2010: A 'Common Sense' Approach to Leadership: An Interview With Kook-jin Justin Moon (https://koreajoongangdaily.joins.com/news/article/article.aspx?aid=2923583) (Korea JoongAng Daily)
QuoteThe Tongil Group is owned by the Unification Foundation, and the mission of the foundation is to support the Unification Church. I am a member of the church and the members of the foundation's board of directors are members of the church. For these reasons, I can not foresee a situation in which the foundation and its business group could be completely separate from the church.
Eight years later, he called for his mother to be executed:
May 21, 2018: Locked and Loaded for the Lord (https://www.washingtonpost.com/news/style/wp/2018/05/21/feature/two-sons-of-rev-moon-have-split-from-his-church-and-their-followers-are-armed/) (The Washington Post)
QuoteJustin Moon is a hyper defender of the Second Amendment. Private citizens, he says, should have unfettered access to any handheld weapon the U.S. military uses. "Were every woman in America to exercise their right to bear arms, America would basically eliminate its crime rate," he told me one morning at Kahr Arms. "Nobody would be able to rape them or rob them." ...
There seemingly is not much interest in reconciliation on the part of her brothers, however. Indeed, kicking Mom out of the family tree was not enough to satisfy Justin Moon. At a question-and-answer session with Church members in 2016, he explained that if a queen tries to usurp a king's throne, the ultimate price must be paid: "It's the king's responsibility to arrest her and execute her."