Just updating Dettmann family matches to Hohenzollern and Radziwill descendants, there are now autosomal DNA results from 10 different members of the Dettmann family, and these have been compared with similar DNA results from 9 different testers in four different families (now living in South Africa, New Zealand, Germany and the USA) who descend from Wilhelm I and/or Elisa Radziwill.
Comparing members of the Dettmann family with each of the other testers, we now have 8 matching results at the minimum 7cM level, and 14 more at the 5cM level, with proof that all four families are related through those lines of descent.