Throughout the New Testament the phrase "son of God" is applied repeatedly, in the singular, only to Jesus. "Sons of God" is applied to others only in the plural. The King James version of the New Testament calls Jesus God's "only begotten son"
(John 1:14, 3:16-18, 1 John 4:9)
single of its kind, only
- "his own son" (Romans 8:3)
himself, herself, itself, themselves
It also refers to Jesus simply as "the son" in contexts in which "the Father" is used to refer to God.
16 "For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life. John 3:16 ESV