Yes the descendents of Dona Isabel de Bragança, Imperial Princess of Brazil, were indeed intitled Princes of Orléans and Bragança, Royal Highness, after an agreement made with the Head of the French Royal House (Orléans), but that agreement does not affect the titles given by the Brazilian Imperial Constitution...So every dynast is a Prince of Brazil, Highness...in addition they are also Ps of O-B, Royal Highness...This way, a dynast is His/Her (Royal) Highness X/Y de Orleans e Bragança, Prince(ss) of Brazil, Prince(ss) of Orléans and Bragança...Only the Head of the House and his/her heir would be styled Imperial Highness, they use the style Imperial and Royal Highness...but apparently many times this style is accorded informally to all Orléans-Braganças even non dynasts...