Was Otto the child of Ludwig and Isabelle? Who raised him?
Yes he was, both parents died when he was less than a year old, his mom od speedballing and dad shot himself. His maternal grandparents fought EA to raise him & won: Ariprand and Maria Annunciata. There is a family Schloss in Carinthia, and most of their children (his mom's siblings, 8 total?) work in the sciences I think; at least the grandad was a physician or geogolist.
Maybe the grandad is the physician and one of his kids the geologist-remember he did an geo analysis of the caves in Corinthia