Isabel de Orléans e Bragança, Princess of Grão-Pará and heiress of the Brazilian Imperial Crown had 3 surviving children.
The elder, D.Pedro, married,unequally, countess Elizabeth Dobrzenzky, but their offspring married quite well, though non-reigning families: the elder, Isabelle, married the Count of Paris and the second, the duke of Bragança. The elder son married a princess of Bourbon Two-Sicilies, sister of the countess of Barcelona. One of their daughters married the youguslavian pretendant.
The younger son, D.Luiz, also married a princess of Bourbon Two-Sicilies and their elder son married a princess of Bavaria. Two of their childrem married in the house of Ligne.
Sure they do: that's why I mentioned the example of Prince Felix of Bourbon-Parma. Normally, a prince does not find it any easier to uproot himself from his native land to marry a foreign princess. But like I said, if he is already an exiled member of a deposed dynasty, it's not that big a deal: he has to live in a foreign country, anyway.
That was precisely the case with the two eldest sons of Prince Alfonso, Count of Caserta, who in 1894 succeeded his older half-brother (King Francesco II) as head of the royal house of Bourbon-Two Sicilies. The eldest (Prince Ferdinando Pio, Duke of Calabria) would eventually succeed his father as the last undisputed head of the house.
The second oldest, as everyone knows, wreaked havoc upon the Sicilian succession by renouncing (for himself and his descendants) the claim to headship of the defunct throne, by marrying the elder daughter of King Alfonso XII of Spain. Insofar as either was obligated to renounce any rights, so as to prevent a union of two crowns for their descendants, it certainly seemed to make more sense for him to do so, since he belonged to a non-reigning dynasty.
Unlike his wife, who was heiress presumptive to her younger brother in an (admittedly shaky and unstable) royal house, still reigning today. The debate over the validity of the renunciation rages today, remaining unresolved. Matters haven't helped with a controversial move by one of the rival claimants to change the succession law in the deposed house, to permit his elder daughter to inherit the claim.
Everybody -- and I suspect this might even be said of the rival factions within the royal house of Bourbon-Two Sicilies, over the years -- wishes to God that Prince Ruggero, Duke of Noto (only son of the titular King Ferdinando III) had lived to marry a royal princess and father multiple sons. For in that scenario, no dispute would have erupted in 1960.
It would have been nice if his father could have been given a Bavarian royal title, as a long-term resident in his mother's native land. After all, his uncle Carlo was created into an Infante of Spain, upon his marriage in 1900 to Infanta Maria de las Mercedes. But of course, this is not the German way (there would have been no precedence for such a thing -- i.e. creating a foreign prince into a prince of Bavaria). It is worlds different from the Spanish way.
Do men count? Franz Ferdinand, Duke of Hohenberg a morganatic grandson of Archduke Franz Ferdinand of Austria married Princess Elizabeth of Luxembourg the daughter of Grand Duchess Charlotte of Luxembourg and her Husband Prince Felix of Bourbon-Parma