In Nigeria, your best friend is not just a friend; they are "omo iya mi"—my mother's child. The phrase makes friendship biological. It says: We are not just close; we are related by choice. Your friend's mother becomes your mother. Their siblings become your siblings. Their family drama becomes your drama. The bond is deeper than Western friendship; it is adoptive kinship. The responsibilities are real. You lend money without contracts. You fight their battles without invitation. You attend their family events without question. You lie for them to their parents. You cover for them with their spouses. The loyalty is absolute because the family connection is assumed. And the heartbreak! When an "omo iya mi" betrays you, it is not just friendship ending; it is family divorce. The grief is deeper. The trust is harder to rebuild. You don't just lose a friend; you lose a sibling you chose. The phrase is most common among Yorubas but the concept is universal. Every Nigerian culture has a version of chosen family. It is how we survive in a country where blood family may be distant or disappointing. Who is your "omo iya mi"? And have you ever had a friendship breakup that felt like family divorce?