Here is a great photograph of Amund and Bertha, courtesy of Ancestry.com member David Pollock.
Amund Olson (1840-1915) is 3rd great-grandfather of MKS in the Wetherbee branch.
Bertha Marie Tonnesdatter (1837-1904) is 3rd great-grandmother of MKS in the Wetherbee branch.
References:
[1] Ancestry.com member David Pollock (photograph).