Albert Barnes Commentary 2 John 1:3

"Grace, mercy, peace shall be with us, from God the Father, and from Jesus Christ, the Son of the Father, in truth and love." — 2 John 1:3 (ASV)

Grace be unto you, etc.

This salutation does not differ from those commonly employed by the sacred writers, except in the emphasis that is placed on the fact that the Lord Jesus Christ is "the Son of the Father." This is much in the style of John, in all of whose writings he dwells much on the fact that the Lord Jesus is the Son of God, and on the importance of recognizing that fact in order to possess true religion. (Compare to 1 John 2:22–23; 1 John 4:15; 1 John 5:1–2, 10-12, 20).

In truth and love. This phrase is not to be connected with the expression "the Son of the Father." as if it meant that he was his Son "in truth and love," but is rather to be connected with "grace, mercy, and peace" (referred to previously), as a prayer that these blessings might be manifested to this family, promoting truth and love.