Oh, I wish I had Introduction to Christianity in front of me. There is an excellent passage wherein Ratzinger rebuts the idea that Christianity lifted the Divine Sonship of Christ Jesus from pagan religions. So I'll give you my (short and underwhelming and slightly modified for clarity) summary of the terms the "Son of God" and the "Son."
"Rejoice and be glad that so great and good a Lord, on coming into the Virgin's womb, willed to appear despised, needy, and poor in this world, so that men who were in dire poverty and suffering great need of heavenly food might be made rich in him." - St. Clare of Assisi
Not all of us are able to be outwardly joyful and glad throughout this season. So THIS article is appropriate. And please pray for you never know when you will reject someone or be rejected, and some people cover it up really well, until the moment they don't, because we're humans whose desires are only fulfilled in God.