George Q. Cannon teaches that God is our literal father in the same way our earthly father is.
George Q. Cannon, "Kind of God the Saints Believe In—Skepticism in the World—Miracles not Due to a Suspension of Law—Results of Faith Exercised By the Saints—Providence in Their Favor—Ideas As to the Form and Attributes of Heavenly Beings—How Joseph Smith Obtained His Knowledge—What Our Faith Has Cost," Journal of Discourses, 26 vols. (Liverpool: John Henry Smith, 1884), 25:155
My brethren and sisters, it is a glorious truth that has been taught to us, that we are literally the children of God, that we are his literal descendants, as Jesus was literally descended from Him, and that He is our Father as much as our earthly parent is our father, and we can go to Him with a feeling of nearness, knowing this, understanding it by the revelations which God has given to us.