Karl Adolf’s father-in-law Carl Viktor Nilsson (1846-1926).
This is Carl Victor Nilsson, the sea captain who became Karl Adolf’s father-in-law and from what I’ve heard his stand-in father. I don’t know much about Carl Victor, but I do know that he kicked his own son off the boat (maybe more than once) for being drunk. It looks to me as if you wouldn’t want to have messed with Captain Nilsson.