Professor: Under the principle of the eldest son's inheritance, the first male baby born by a man's first wife always has the right to inherit family property first. Student: That's not true. Mrs. Houston is the only alive of his father's only wife Child, she inherited all his legacy. The student misunderstood what the professor meant, what did he understand? ['A man can be the father of a child.', 'Daughter cannot be counted as the first child born.', 'Only sons can inherit property.', 'Illegitimate children cannot inherit property.']