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
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