Given his age I'd say any power structures or succession planning is well in hand, but might be worth keeping an eye on.

Luxembourg's Grand Duke Jean dies at 98

BRUSSELS (Reuters) - Luxembourg’s Grand Duke Jean, who oversaw the transformation of the Grand Duchy into an international financial center, has died at the age of 98, the Duke’s son Henri said in a statement on Tuesday.

https://www.reuters.com/article/us-belgium-royal-death/luxembourgs-grand-duke-jean-dies-at-98-idUSKCN1RZ0EZ

http://archive.is/KyqfO