What is real sister and brother?

Real sisters and brothers are siblings who share the same biological or adoptive parents. They may have a close relationship or a more distant one, depending on their personalities and life experiences. Siblings can have a significant impact on each other's emotional and social development, and they may have lifelong connections that shape their identities and relationships. While siblings may have conflicts and rivalries at times, they also often have a deep bond and a sense of loyalty to each other.