Male heir
A male heir (sometimes heirs male)—usually describing the first-born son (primogeniture) or oldest surviving son of a family—has traditionally been the recipient of the residue of the estate, titles, wealth and responsibilities of his father in a patrilineal system. This system may vary by region but has ancient, perhaps prehistoric, origins, and appears in the Code of Hammurabi: "Since daughters marry strangers and thereby cut themselves off from their family, only sons inherit the paternal estate.