I think that you mean not Krasnador, but Krasnodar. It's a rather big city, so it would be difficult to find information about the Kremer family. But you could appeal to the State Archives of Krasnodarskiy region. Here is the address: Russia, 350058, Krasnodar, ul. Stavropolskaya, 151-a You letter should be in Russian. If you need help with translation, please contact me.