Kira's husband was baptised Louis Ferdinand. Not Ludwig.
In terms of the succession, he was rather old-fashioned, which is not a surprise. He came to the inheritance because his older brother married morganatically. Moreover, the Kaiser's Will provided strict instructions for inheritance.
The eldest son, Wilhelm, tried to claim (after dad's death) that his second marriage to Ehrengard was equal. It wasn't. Michael also tried the same with his second wife, Birgitte (saying she was a von Dallwitz -- she isn't. Wilhelm divorced Ehrengard and has married a third time.
Marie Cecile (not Cecilia) is divorced from Friedrich - and yes, he is married to her sister-in-law. Donata was not the reason for the breakup however. There was a bit of consernation regarding this marriage -- even Louis Ferdinand was a bit upset by it, because he was rather protective of Donata.
Kira died of cancer.
Georg Friedrich maintains a home in Berlin, but did live for a time in the Rüdenhausen area. He is probably closer to his mother's family than his father - especially due to the court case. But he has been trying to mend fences.
