. . . "Years later, it is revealed that Siegfried, his brother Helmut and an unnamed sister are triplets but it is not stated whether this refers to the same sister seen previously. [Mentioned, TV Movie: \"Get Smart, Again!\"]"@en . "Siegfried's Sister"@en . "Years later, it is revealed that Siegfried, his brother Helmut and an unnamed sister are triplets but it is not stated whether this refers to the same sister seen previously. [Mentioned, TV Movie: \"Get Smart, Again!\"]"@en . .