1st Nephi 1 : 8
And being thus overcome with the Spirit, he was carried away in a vision, even that he saw the heavens open, and he thought he saw God sitting upon his throne, surrounded with numberless concourses of angels in the attitude of singing and praising their God.
Dad wasn’t familiar with the rules of prophetic visions. Whether he was spiritually transported somewhere or experienced the whole thing in his room, the stuff he saw was definitely not of this world. It was like a huge door opened into the heart of heaven. And there on a throne, surrounded by an impossible number of singing angels, sat God the Father.