It tells us in I Thessalonians 5:23 that only God is able to sanctify or make holy since He alone is holy. And so it is by this sanctification process we are accepted into the family of God receiving the Spirit of Sonship or adoption. (Romans 8:17) Thus as newly adopted brothers and sisters into the family we become co-heirs with Jesus. And because we are now family, Jesus is not the least bit hesitant to call us His brothers and sisters.
Safetypinlove 