Thank you for your help. I will visit the sites you suggested. However, I understand that a lot information may not be available. That was the same story in my family. Documents, correspondence, deeds etc. were all destroyed due to fear of persecution and death. Unfortunately none of these measures helped. Most were exiled or executed. Now it is left to my generation to start putting together the little information that exists and to try to make a picture. It will be a difficult task.