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Basically as the tin says, what happens with Brazil and Portugal if all three legitimate sons of Emperor Dom Pedro I of Brazil survive and have issue?

In OTL these were

Miguel, Prince of Beira 26 April 1820
João Carlos, Prince of Beira 6 March 1821 – 4 February 18
Emperor Dom Pedro II 2 December 1825 – 5 December 1891
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