noun
the same parents
Refers to siblings or individuals who share both biological parents. Often used in legal or family-registry contexts.
彼らは同父母の兄弟です。
They are siblings by the same parents.
実の兄弟 is a more common, everyday term for 'biological siblings', while 同父母 is more formal and explicit about sharing both parents.
Compound of 同 (same) and 父母 (father and mother, parents).