In addition to Donalbain, who else is a son of King Duncan in Shakespeare's Macbeth?
King Duncan: King Duncan is a fictional character in Shakespeare's "Macbeth." King Duncan:  He is the father of two youthful sons (Malcolm and Donalbain), and the victim of a well-plotted regicide in a power grab by his trusted captain Macbeth. Donalbain (Macbeth): Donalbain is a character in William Shakespeare's "Macbeth" (c. 1603–1607).
Malcolm