When parents have children with different partners, it can create complex family dynamics. In this situation, a person may have one or more siblings who share one parent with them. There are many synonyms for the term "brother by one parent," depending on the context and cultural norms. Some commonly used terms include half-brother, stepbrother, and "brother from another mother." These terms are used to denote a familial relationship between siblings who are related through one parent only. It is important to respect the preferred terminology of individuals when discussing family relationships.