The challenge is simple. Napoléon set to remaking Europe's monarchs in his own image by appointing his siblings (as well as some other lucky non-relations) as kings of various states. However, the various lines of their legitimate descent have petered out (if I'm not mistaken it's only Caroline and Jérôme who still have legitimate heirs running around today).
Your goal is to have the current monarchs in the country that was ruled by a Napoléonic appointee DESCEND from said appointee.
Thus, it would be:
The current king of Spain (or his heir) descends from Joseph Bonaparte
The titular king of Naples from Joseph and/or Murat
The titular king of Italy (doesn't really matter if he's from the main line or the Aosta line) from Eugène de Beauharnais
Grand duke of Tuscany from Elisa, any monarchs in the Netherlands from Louis etc.
Jérôme is a bit more difficult, since Westphalia sort of implodedafter Napoléon fell, but let's suggest that Hesse and/or Hannover (any other major German royal family is also fine, but preferably those ones).
Rules:
- No tweaking of the current monarch's heir to marry a descendant (so, for instance, the daughter of King Felipe VI can't suddenly marry a descendant of Joe Bonaparte). It has to be the monarch ruling or his spouse descends from the Napoléonide ruler.
- The monarch does not necessarily have to still be reigning (i.e. the Italian royals), simply head of house/heir apparent is also acceptable
- The Napoléonide royals CANNOT stay in power AFTER 1815. So no lasting Murat kingdom of Naples or Beauharnais kingdom of Italy or the like. Second Empire is acceptable (and also why I didn't include a French heir in the list. I'd think it absolutely cool if we could have either the duc d'Anjou or whatever the Orléanist heir's title is descended from a Bonaparte (we've got the Bonaparte heir descended from the Bourbons so why not)) OTOH, although I'm not sure Napoléon III was so eager about repeating THAT mistake of the First Empire.
- Bonus points if the descent from said Napoléonide can be spread to MORE than one royal family (which would probably presuppose a pre-1940s cut-off point)
- Bonus points if the monarch descends from more than one Napoléonide.
- Bonus points if the monarch descends from Elisa's or Pauline's sons.
- Points will be awarded for descending through a bastard (one of Napoléon III's illegitimate sons, or Joseph's daughters by Annette Savage (or his son by the Colonna lady)), but since this is royalty, legitimacy is preferred.
Looking forward to how we can make this happen