Bertin Roald Marskar - Evidence for daughter Gerd?

I cant see that connection on the profile

Gerd Ellinors maiden name should however be Olsen, not Krystad according to the wedding announcement in the newspapers in December 1966, but I dont have access to change it. The announcement startes however that both is from Grovfjord where Bertin lived.
Her birth date is correct according to official tax records.