👉 In the context of family dynamics, an "outbrother" is a sibling who has been born after their biological brother or sister. In many families, this relationship is not considered part of the biological family structure but rather as a legal and social arrangement. The concept of an outbrother can be seen in various cultures, including Latin American traditions, where it is often referred to as "el hermano que no tiene hermana" (the brother who does not have a sister). This