In Joseph Smith’s last public sermon given on 16 June 1844, Joseph Smith again turns to the subject of the history of God. This time he offers what he felt sure was biblical support for the idea that God the Father had a father. He found it in the language of the King James Version’s translation of Rev 1:6: “And hath made us kings and priests unto God and his Father . . . [italics added],” in accordance with which, he says, there clearly exists “a God above the Father of our Lord Jesus Christ.” Smith was incorrect in seeing this as the true implication of the passage, a better translation being “unto his [Jesus’] God and Father” (see, e.g., niv).
Ronald Huggins in a JETS article refutes this claim and many other claims of Mormonism.