I too am researching the Vanderwerf family. My husband's distant cousin married Adrian Vanderwerf. They lived in Narrowsburg, NY and never had any children, however, Anna did have a daughter, Dorothy, by her first husband.
It is our understanding that Adrian was a Dutch sailor and jumped ship, we believe, in NY harbor. He married Anna it is believed sometime in the late 1920s or 1930s.
Could our lines be related? Please email @ firstname.lastname@example.org
whether or not our lines are related.
Look forward to hearing from you soon!!!