Upvote:5
It seems highly unlikely that this story is true.
Searches on other sites (not just Wikipedia) do not mention it at all. There is no citation on the Spanish Wikipedia page to support the claim.
It is always worth checking the edit history in these cases.
The page was edited to include the claim by an anonymous editor on 6 July 2018. No supporting citations were included in support of the claim.
If we look at the contributions by that anonymous editor, we see that this is the only page that they have contributed to.
Given the lack of any supporting citation, and the fact that a search of other sites has failed to find any evidence whatsoever to support the claim, I would treat it as spurious.
This is just an example of what can happen with a crowdsourced resource like Wikipedia, and why one should always be cautious about taking claims without a supporting citation at face value.
Upvote:6
To add to sempaiscuba's answer:
Although there was a 'Prince Pierre d'Orleans', his full name was Pierre Philippe Jean Marie d'OrlΓ©ans, not Pierre Antoine Lacouture d'Orleans. The only other 'Prince Pierre' is 13th generation and would appear to be still living (and is maybe still a child).
The supposed son Louise Anton de Lacouture de Hohenzollern-Sigmaringen y de Orleans' supposed wife does not exist: according to the Rockefeller Archive Center, John D. Rockfeller did not have a daughter called Marie (or Maria or Mary etc).
The Spanish Wikipedia page for John D. Rockefeller was edited to add 'Marie' at around about the same time as Maria Luise von Hohenzollern-Sigmaringen's Spanish page was edited. However, 'Marie' does not appear on the English, Portuguese or French (or any other) pages I checked for JDR.
The alleged present-day descendant Pierre Lacouture Rockefeller de Hohenzollern-Sigmaringen y Murat cannot be the 9th prince of Murat. The current prince is Joachim; he's the 8th prince and is very much alive. His current heir is also called Joachim and will presumably become the 9th prince when papa departs.