Son of God, Son of Mary (WSC 21-22)

Our catechism asks in question 21:
Q. 21. Who is the Redeemer of God’s elect?

A. The only Redeemer of God’s elect is the Lord Jesus Christ, who, being the eternal Son of God, became man, and so was, and continueth to be, God and man in two distinct natures, and one person, forever.

Q. 22. How did Christ, being the Son of God, become man?

A. Christ, the Son of God, became man, by taking to himself a true body, and a reasonable soul, being conceived by the power of the Holy Ghost, in the womb of the virgin Mary, and born of her, yet without sin.