No, that is the Golden Plates. Nothing in there told him to marry children. I don't believe he should have done that, or some of the other things he did, but despite leaving Smith after a dispute, NONE of the Witnesses of the Golden Plates renounced their testimonies of them, even on their deathbeds. Now, before you ask me why Smith believed he should have done what he did with having multiple wives, the answer to that is I don't know. Same goes for Brigham Young. However, I do know the LDS church broke apart in 1890 over a dispute of polygamy. The broken away part is now the FLDS (Fundamentalist Latter Day Saints)