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Here we have Alfonso and Juan Carlos, as cute as can be.
Albert and Baudoin, sons of Leopold III.
The four sons of King George: Edward, Albert, George, and Henry.
Here we have the three sons of of Gustaf V: Gustaf VI Adolf, Wilhelm and Erik.
The current King Jigme Khesar is shown on the bottom left of the photo. The other four brothers are Jigyel, Ugyen, Jigme Dorji, and Khamsum, all sons of Jigme Singye on the far right.
Nikolai, Felix and Henri, sons of Joachim.
What other royal brother photos come to mind? Show us your favorites in the comments.