Jesus is the Son of God, not of the Holy Ghost. Just as Jesus is literally the Son of Mary, so he is the personal and literal offspring of God the Eternal Father, who himself is an exalted personage having a tangible body of flesh and bones. (D. & C. 130:22.)
Apostate religionists—unable to distinguish between the Father, Son, and Holy Ghost—falsely suppose that the Holy Ghost was the Father of our Lord. Matthew’s statement, ‘she was found with child of the Holy Ghost, ’ properly translated should say, ‘she was found with child by the power of the Holy Ghost.’ (Matt. 1:18.) Luke’s account (Luke 1:35) accurately records what took place.
Alma perfectly describes our Lord’s conception and birth by prophesying: Christ ‘shall be born of Mary, … she being a virgin, a precious and chosen vessel, who shall be overshadowed and conceive by the power of the Holy Ghost, and bring forth a son, yea, even the Son of God.’ (Alma 7:10.) Nephi spoke similarly when he said that at the time of her conception, Mary ‘was carried away in the Spirit, ’ with the result that the child born of her was ‘the Lamb of God, yea, even the Son of the Eternal Father.’ (1 Ne. 11:19–21.) As Gabriel told Luke, he was the ‘Son of the Highest’ (Luke 1:32), and ‘the Highest’ is the first member of the godhead, not the third.
(Bruce R. McConkie, Doctrinal New Testament Commentary, 1:82–83)