Ruediger of Saxony and his succession rights

[Kotroman]

If I understand the succession law in Luxembourg correctly, the succession is restricted to the heirs-male of Grand Duke William IV's daughters.

So, are the heirs-male of Crown Princess Sophie of Saxony in the line of succession to the throne of Luxembourg after the heirs-male of Charlotte? In other words, are Prince Ruediger of Saxony and his sons in the line of succession?

[MAfan]

Theoretically the male line heirs of Princess Sophie can succeed to the throne in Luxembourg; the problem is that all her descendants were born from morganatic marriages, so I really don't know if Rudiger can succeed or not.