Ah, good old Sixte, still full of hatred. What a nice welcome in the family for Viktória.
I wonder who according to Sixte is able to continue the line then. No other Parma dynast married ebenburtig... in fact even his fathers marriage to a bastard branch of the house of Bourbon can be considered morganatic. Or is a mere noble good enough for Sixte after all? In which case prince Michel and sons can be considered his successor. I wonder if he and his sons support Sixte of Carlos Xavier. In general the family doesn't seem too close so probably they don't want to get mixed up in the feud.