The  German branch of Kaas, called von Althaus

The younger son, August Heinrich Jacob von Althaus, moved to Baden, South-Germany, where he studied to dr. phil. He became a captain in Baden, later chief of the mines. His barony title was confirmed by the Duke of Schaumburg-Lippe and then recognised by the Great Duke of Baden. He married Maria G. Caroline Baroness von Reischach. When she died three years later, he married her sister Ernestine, with whom he got at least three children. Descendants of them continue the German branch of Kaas with the surname von Althaus. Whether there are living persons in this branch is not yet determined - research is going on  (2012).