We are installed and appointed as God's sons and daughters, and granted all the status and privileges of the children of God. We said the basis of this is the love of God that is lavished upon us, and that is the wonderful thing about adoption. You don't just adopt a child that you don't love. God loved us from all eternity and has adopted us into his family. Adoption is like justification, not like sanctification.
Sanctification is a process.
It is continuous. But adoption is like justification - a one time action. Like justification, it is the action of God the Father. It is not the action of God the Son or God the Holy Spirit. It is the action of God the Father.