The spiritual bonds that we can form with others by living out the will of God can be even more profound and important than the the ties of kinship that bind us to our biological family.
Based on Matthew 12:46-50:
While Jesus was still speaking to the crowds, his mother and his brothers were standing outside, wanting to speak to him. Someone told him, ‘Look, your mother and your brothers are standing outside, wanting to speak to you.’ But to the one who had told him this, Jesus replied, ‘Who is my mother, and who are my brothers?’ And pointing to his disciples, he said, ‘Here are my mother and my brothers! For whoever does the will of my Father in heaven is my brother and sister and mother.’
(New Revised Standard Version Bible: Anglicized Edition, copyright © 1989, 1995 National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved worldwide. http://nrsvbibles.org)