Definitions for "Son of God"
The Savior, Jesus Christ.
Term applied in Jewish tradition to a Davidic king, Israel as a whole, a righteous Jew, an angel, etc. Applied by Christians to Jesus.
Besides Jesus Christ, all of us are viewed as the children of God, his literal spirit children. This makes us all - Mormons, non-Mormons, Jesus Christ and Satan - spirit brothers. See Pre-existence and Spirits.