Richard D. Draper and Michael D. Rhodes draw on Joseph's teachings to explain the mention in Revelation 1:6 about "God and his Father."
Richard D. Draper and Michael D. Rhodes, The Revelation of John the Apostle (Brigham Young University New Testament Commentary; Provo, UT: BYU Studies, 2013), 68
Unto God and his Father/to his God and Father: The reading of this verse in the KJV suggests that Elohim had a father. The JST changes the text to read, “unto God his Father,” thus clarifying that Elohim was the Savior’s father. However, ten years after making this change, due to further understanding concerning the divine mysteries, Joseph Smith stated that the KJV reading, “God [meaning Elohim] and his Father,” was correct for “John discovered that God the Father of Jesus Christ had a Father, [and] you may suppose he had a father also.” He went on to say that the ancient Apostles taught the plurality of Gods, having discovered for themselves “that there were Gods above” our own.