By being in Christ, Gentiles inherit God’s promises to Abraham. All of the Galatians are heirs (sons) of God. They have been baptized and have clothed themselves with Christ. Therefore, “There is neither Jew nor Greek, slave nor free, male and female, for you are all one in Christ.” (No ethnic, social, gender differences). Since all belong to Christ, they are all. Abraham’s “seed” (plural here). Being an heir, of course, depends on status. Children are not free, but under guardianship and trustees. Pre-Christ, we were all like slaves subject to basic principles of world. We also were not free, but under guardianship and trustees (law). When the time came, age of majority was reached. Believers are no longer subject to any period of enslavement. God sent Jesus (born of a woman under the law) to redeem us. Jesus essentially bought us out of slavery so now all have rights of sons. As sons, we can authentically call God, Abba, Father.