A biological sibling is a person who shares at least one biological parent with another individual. This means they have inherited genetic material from the same mother or father, making them part of the same family lineage. Biological siblings can be full siblings, sharing both parents, or half-siblings, sharing only one parent. The relationship between biological siblings can vary widely, influenced by factors such as age, personality, and family dynamics. They often grow up together, sharing experiences and memories, which can create strong emotional bonds. This connection can be important for social and emotional development throughout life.