Looking for Nagel Family Cobodin Constanta

Birth records for all the children of Matthias Nagel and Luise Knoll. I believe there were 10 and I can only find records for 3. These children would have been born some time before and including 1921, when my mother was born. She was the youngest and Pauline was the oldest. Matthias, born in 1927 was missing in action during the war and presumed dead in 1945. If you have any information of any of the other seven children, I would really appreciate it. Thank you.