Lessee, both my grandfathers were Swedish. Maternal grandfather was a dentist in Gothenburg with his own business. Wartime played marry hell with it, since he got called up and sent to various parts of Sweden for shorter or longer periods depending on the situation on the Swedish borders. Not very exciting. He bought a nice summer house outside of the city, by a lake, to be able to evacuate the family there if the war came for real and Gothenburg was subjected to bombing. Family still owns it.
Paternal grandfather was chief of police in a major town along the Norwegian border. He was also a dedicated anti-Nazi (as an effect of also being a rabid anti-German), meaning he formed part of the network of Swedish police aiding the Norwegian resistance crossing the mountains. If the pro-Nazis in the police found them, they tended to get handed back over the border to the waiting Germans. If the anti-Nazis did it, they got spirited down to my grandad's town. When the French Republic remembered their friends after WWII they even awareded him some minor decoration for services rendered to French citizens.
He also spent the early part of the Finnish War of Continuation beginning alongside Barbarossa as an official observer for the Swedish government. Apparently he just went missing one night, didn't return from office in the evening. His wife, my grandmother, received a cable from Helsinki three days later briefly explaning where he'd gone off to and why, also instructing her to sew up some decent winter camo, which did come in very handy as he found himself in Finnish positions strafed by Soviet fighter-bombers on several occasions.
Being an anti-Nazi complicated family dinners during the war, since two of his three brother's in law were navy men, with a kind of a traditional military mistrust of anything the "Anglosaxons" got up to. One of them was even married to the daughter of one of the leading Swedish Nazis in politics of the time, so family dinners were hellishly complicated.
This maternal uncle of my father also holds the distinction of being the sole survivor of the crew of the Swedish submarine "Ulven", which hit a mine, sank, and two weeks were then spent on unsuccessfully try to raise it and save the crew trapped inside. It was one of the things which galvanized the attention of the Swedish public at the time. He wasn't on board, since he'd been granted leave to got to his brother's, the other naval officer, wedding.
He was quite pro-German during the war, by the revelelation of the Nazi concentration camps made him go off Germany completely towards war's end. He retained the opinion that all British and Americans were cynical and useless bastards all his life though, so no change there.
After the war he further distinguished himself by being the destroyer commander who found the wreckage of one of the spy-planes shot down by the Soviets over the Baltic, flewn by the Swedish airforce on behalf of the British and US intelligence establishment. (Not the first shot down, but the second, sent to search for the first, iirc. I've seen newspaper clippings of him holding some canvas or something fished out of the Baltic.)
He also claimed to have managed to, in heavy fog in the late 40's, completely by mistake manouver his destroyer into the Leningrad military harbour area. Some confused siganalling occurred on the Soviet side, and as they realised their mistake, they turned the destroyer around and disappeared into the fog as fast as their little propellers could carry them. He used it later in life to defend his opinion, that the Whiskey class Soviet submarine found stuck on a ground in a Swedish military protected area in the early 1980's must have ended up there by mistake, citing his own experience of how "These things happen!"
