I believe the Father came down from heaven, as the Apostles said he did, and begat the Saviour of the world; for he is the ONLY-begotten of the Father, which could not be if the Father did not actually beget him in person. ... I believe the Father came down in His tabernacle and begat Jesus Christ.
[Source: The Complete Discourses of Brigham Young, Ed. Richard S. Van Wagoner, Smith-Pettit Foundation, Salt Lake City (2009), http://bit.ly/BY-discourses]