With the Incarnation, the “promises” and “figures” of the Old Testament become “reality”: places, persons, events and rites interrelate according to precise divine commands communicated by angels and received by creatures who are particularly sensitive to the voice of God. Mary is the Lord’s humble servant, prepared from eternity for the task of being the Mother of God. Joseph is the one whom God chose to be the “overseer of the Lord’s birth,”(27) the one who has the responsibility to look after the Son of God’s “ordained” entry into the world, in accordance with divine dispositions and human laws. All of the so-called “private” or “hidden” life of Jesus is entrusted to Joseph’s guardianship.
The “figure” in the Old fully realized in the New is the person Joseph son of Jacob (In Matthew, Jacob is father of St. Joseph, Spouse of the Blessed Virgin).
Today’s ANTIPHON (Cf. Lk. 12:42):
Behold a faithful and prudent steward, whom the LORD set over his household. (My emphasis).
Joseph in the Old answers those who are possessed to claim that after the birth of Jesus, Mary and Joseph had marital relations i.e., that their marriage was no longer virginal:
8 But he refused and said to his master’s wife, “Lo, having me my master has no concern about anything in the house, and he has put everything that he has in my hand;9 he is not greater in this house than I am; nor has he kept back anything from me except yourself, because you are his wife; how then can I do this great wickedness, and sin against God?” – Gen 39:8-9 (RSVCE).
 Redemptoris Custos (Guardian of the Redeemer), 8, Apostolic Exhortation by Pope St. John Paul II [the Great] on St. Joseph, August 15 – the Solemnity of the Assumption of the Blessed Virgin Mary – in the year 1989.
The Grandeur of St. Joseph by Dom Bernard Marechaux in Feast of St. Joseph 2017 | Torch of The Faith News, Sunday 19 March 2017