I have no advice, but I will pray for you and your brother. Thank you so much for sharing your story with us. I love reading these stories that people bring to the forum.
How serious was your upbringing in the Church of Jesus Christ of Latter-day Saints? I live just a stone's throw away from their Garden of Eden in Jackson County, Missouri. There are a lot of Reformed Latter-day Saint churches around where I live, now called the Community of Christ. Up until recently, they retained the biological line of Joseph Smith, Jr. in their headship. Anyway, Mormonism is fascinating to me. Have you been inside the temples? If so, can you explain some of the secret rites to us? Also, do the normal church services follow any sort of liturgical structure? I only ask because as I understand it the temple rites are very specific, so I didn't know if the rubrics for weekly worship are rigidly structured.
My LDS upbringing was extremely serious. My Mormon roots go back five generations on both sides of the family, all the way back to the first waves of English conversions in the 1830s. My ancestors drove wagons and pulled handcarts across the Plains to Utah in the 1840s. That background should tell you that I didn't belong to the Missouri-based Reorganized church linked to Joseph Smith's descendants, but rather to the much larger and more visible Utah sect linked to Brigham Young. It also means that I have polygamy in my ancestry, since the Missouri sect always refused to accept that polygamy was valid - one of the reasons, along with the succession issue after Joseph Smith's assassination, the Missouri sect exists.
Yes, I have been inside a Mormon temple. I've been in four of them to be precise - the most important one in Salt Lake City (that's where I was married), another in a Salt Lake suburb, one in St. George, Utah, and the one in Provo, Utah across the street from the BYU campus. I also served a mission, you know, the men on bikes in white shirts and ties and a name tag. That was me almost 25 years ago, when I was 19-21 years old, the standard age when Mormon males serve their mission. I also graduated from 4 years of seminary, though it's different for Mormons. You don't go to seminary to become a priest. Rather, seminary is for teens in junior and high school to teach them the doctrines of the faith. I graduated from seminary in Utah and received my diploma, the same year I received my high school diploma in a public school. In Utah, seminary is tied to attendance during the last four years of the public school curriculum, grades 9-12. Seminary is a course you take during the regular school year and it's added to your high school schedule. Mormons get around the obvious church-state issues by placing the seminary building on church property in close proximity to the school and signing up for "Release Time" on the school schedule. In high school, the seminary building and school were connected by a sidewalk and separated by a fence. So yes, it's safe to say that my upbringing in the LDS church was very serious. I spent nearly my entire life in it, and only left it officially in March '08 when I was baptized a Roman Catholic. I knew nothing about Orthodoxy at the time, ironically enough. It was through my continuing studies of Catholic history that I discovered Orthodoxy and learned the shocking (to me) truth that it best preserves the organization, traditions, and worship of the early Christian church. The first shock came as a Mormon, when I learned there was no Great Apostasy and that the earliest Christian worship was liturgical. That's what made me Catholic. The shock about what Catholicism has jettisoned over the years came only within the last 8 months or so, which is why I now attend divine liturgy.
I'm happy to answer any questions you might have about Mormonism. Regarding the temple, let me briefly say (due to lack of time at the moment for more detail) that, ironically, Orthodoxy today, Catholicism (originally, but less so now with the dilution of the liturgy), and Mormonism share a temple orientation and rites derived from the Jewish temple. The difference is that Orthodoxy and Catholicism all come from the same source: the Apostles, who were all temple-attending Jews who received their teaching from Jesus himself. Mormon temple rites come from the esoteric tradition in the West, through the Masonic Lodge. That esoteric tradition is rooted in gnosticism, which is a corruption of the authentic Apostolic tradition. That explains why Mormon temples have a veil and the doctrine of human deification, just as Orthodoxy has the iconostasis and theosis. Both are rooted in the Jewish temple, but Mormonism derives from heretical traditions that corrupted the original temple-based apostolic teaching about the meaning of sacrifice in a temple context. An Orthodox temple is all about Jesus as our Great High Priest, the lamb of God, and how His eternal sacrifice washes away our sins; the Mormon temple is all about gaining special knowledge reserved for the select, righteous few, including the wearing of special temple clothing (patterned after the clothes masons in the early 19th century wore), transmission of sacred symbols, a new name, handshakes, and passwords as the key to pass through the temple veil - all of which was borrowed from the masonic lodge and the gnostic, esoteric tradition and elaborated upon by Joseph Smith when he created the LDS temple rituals. Traditional christian topics like atonement and sacrifice are emphasized in LDS church buildings during the weekly worship services; the gnostic, esoteric approach is the emphasis of the rites in LDS temples. This is a huge topic. But suffice to say that I am very familiar with the LDS temple rituals and how they've changed over the years, as well as their origin - though active LDS will disagree with me, of course. They believe Joseph Smith received the temple rites by revelation from God, and those in the know frankly acknowledge the similarity between the masonic lodge and the LDS temple. Like Joseph Smith, who first offered the explanation, they believe that the masons have a corrupted rite inherited from the Temple of Solomon and that Joseph Smith restored the true temple rite. This is poppycock, of course. Scholars are well aware of what kinds of things occurred in the first Jerusalem temple, and they didn't look like the masonic lodge. Anyway, as I said, this is a huge topic. We can discuss this further if you wish. It might be easier to just point you to the sources I consulted as I investigated these topics. I'm no scholar, just a consumer.