There is much counsel given in the Book of Mormon by fathers to their sons (examples are 2 Nephi 1–4; Mosiah 1; Alma 36–42; Moroni 8–9).
Mormon, like Paul, desired to quickly eradicate doctrinal misunderstanding and false practices among the people. So he, like Paul, wrote letters of clarification and correction. For instance, Paul wrote to Timothy, his son in the gospel, to give him guidance and encouragement to rectify apostate conditions. Now, more than three centuries later, Mormon wrote to Moroni, his son, to lay down the very points of the true doctrine of Christ. There is a tender and loving feeling between the father and the son. “I am mindful of you always in my prayers,” wrote Mormon (compare what Paul wrote to Timothy, in 2 Timothy 1:3).