I found in the Wisconsin Historical society index an Olaf Berg who died December 9, 1897 In Portage County. This may be his father.
Death Record Details
Last Name: Berg
First Name: Olaf
Day: 09
Month: December
Year: 1897
County: Portage
Reel: 035
Volume: 01
Page: 0063
Image: 1934
Index Vol:
Sequence #: 024631
Web page is: http://www.wisconsinhistory.org/vitalrecords/index.asp?id=26...