After the Mormons went to Utah withgout the Smith family Joery Smiths widow Emma Smith told her children that joey had never had any polygamous relationships...
She pretended for the rest of her life that her cheatin no good husband had been true to her...
When 2 of the Smith boys went to Utah years later Brigham Young realized they didnt know and sadistly got pleasure out of revealing the truth of Joeys serial adultery to them...
the truth destroyed one and messed up another...
That is your belief, not a statement of fact. The facts are that Emma Smith was an honest woman, who fully understood before the interview with Joseph Smith III that church leaders did not want any coverup whatsoever, that they wanted to know the truth even if it was ugly. Emma Smith answered the questions, and the net result was that the wife of Joseph Smith Jr stated that to her knowledge he had no other wives, spiritual or otherwise. Since the interview was conducted just before she died, it was published as "Last Testimony of Sister Emma" in Saints' Herald for October 1, 1879.
Soon after that publication, "the people in Utah became greatly agitated" (RLDS Church History 4:290). In the interview, Emma had testified that there was no revelation on polygamy prior to her husband's death. That meant that Brigham Young had fabricated it, and the Utah membership had been lied to.