And he answered and said unto them, My mother and my brethren are these which hear the word of God, and do it. (Luke 8:21)
Christ had earthly family members, yet here He defines those who are His true family: it is we who hear the word of God and put it into practice. Paul affirms this idea in Romans 8:17 by saying we are joint-heirs with Christ. So believe and go forth living righteously, knowing that you are of the family of God.