"There Is One God And One Mediator Between God And Men, The Man Christ Jesus" 
1 Timothy (2:5)

5. What Is Man’s Relationship With Christ?

A Relationship with Christ means: (We are Brothers/Sisters with Christ)

We become brothers and sisters with Christ, NOT children of Christ (Matthew 12:50; Mark 3:35) we are therefore ONE with Christ, being adopted sons and joint heirs with Christ (Romans 8:17; Galatians 3:28-29; Galatians 4:4-7)

Note: Of course that is only those who have made Jesus Christ their Lord [master], to the glory of God the Father (Acts 2:36; Philippians 2:11).