What does the Bible say about being part of God's family?

The Bible emphasizes that God is not the Father of all people but specifically the Father of those who are saved by grace through faith in His Son, Jesus Christ. In Matthew 12:50, Jesus identifies His true family as those who do the will of the Father, showing that the family of God consists of those chosen before the foundation of the world, redeemed by Christ's blood, and born again by the Holy Spirit. This unique spiritual family is not a universal brotherhood but a specific lineage created through divine election and the grace of God, as seen in Ephesians 1:4-5.