If Mary is the Mother of Jesus, why isn't the Holy Spirit called his father?

St. Matthew makes it very clear that Mary is truly the Mother
of Jesus, and this is affirmed also in the other Gospels many times
over. Throughout the Gospels and in the Churchs Tradition, Mary is
called the Mother of Jesus. Indeed, we know that (because Jesus is
one divine person) Mary is truly said to be the Mother of God.
However, given that Mary is the Mother of Jesus with respect to his
humanity, why do we not call the Holy Spirit the Father of
Jesus?