A lot of information about Gerhard and his wifes has become available through the booklet “What I know about my ancestors” of their son Paul (1871).

Paul wrote a most interesting book in which he talks about his ancestors, but then he also describes his own life. About his childhood, marriage, work and his experiences in the First World War. A very fascinating story! 
Was ich von meinen Vorfahren weiss
Wat ik van mijn voorvaderen weet
What I know about my ancestors

L