How does the Catholic Church explain the term “the Son”: in the Sign of the Cross as well as in Matthew 28:19?

We read at Mtt 28:19: > Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit. In the Sign of the Cross we take the name of the Father, of the Son and of the Holy Spirit in that order. Jn 1:14 also says: "And the Word became flesh and lived among us, and we have seen his glory, the glory as of a father’s only son, full of grace and truth.” That implies that the Son we refer to in the Sign of the Cross is the pre-incarnation person of the Trinity. If it meant Jesus, his name would have to be preceded by Holy Spirit by whose power he was born of Virgin Mary. My question therefore, is: **How does the Catholic Church explain the term “the Son” in the Sign of the Cross as well as in Mathew 28:19?**