A family takes their two boys to Switzerland, and they have many adventures. My aunt can’t recall whether it was a fiction or non-fiction book or whether it was written for children or adults. She read it as a child, and it belonged to her grandparents who lived on a ranch in Southern California. My aunt thinks it may have been written in the 1800’s (she was a child in the 40’s).
Anything you can do to help will be much appreciated!!