My maternal grandmother was born in 1912 and immigrated from Scotland to Canada at age 15. As a consequence she was extremely partial to British cars, which were actually sold in eastern Canada still well into the 1970s. That's all she ever had including a late 50s Vauxhall Cresta, a Vauxhall Victor Estate wagon which almost didn't have the juice to drive the Cabot Trail safely, and some sort of Rootes Arrow Sunbeam as well. Her last car was a mid 70s brown Morris Marina 3dr Hatch (badged as Austin in Canada).
My maternal grandfather was a minister and from what I have gathered, generally rather eccentric. He also worked as a carpenter and blacksmith in the community and had to haul a lot of stuff around, but felt that pickup trucks were not a socially appropriate mode of transportation for a man of the cloth. As a result he almost always had station wagons and these wagons were almost always loaded to the gunnels with odds and ends. I don't know what his favorites were but I know the last car he had was a mid-80s Chevrolet Caprice Estate in plain white sans the "ostentatious" wood paneling. I also have a picture of him where he had been posing with a deer he bagged on a hunt draped over the hood of what appears to be a 1948 Dodge...
My paternal grandmother really only drove what my grandfather had although she tells me that she had a 1976 or 77 Monte Carlo and of course a 1969 Acadian Canso (Rebadged Canadian Nova 4door) in Seafoam Green. My dad later drove this car as well (more or less into the ground).
My paternal grandfather had a LOT of cars in his life and was generally a staunch Ford and Chrysler man (with notable exception of his last car, a 2007 Impala that we talked him into buying, a 1981 Electra Coupe, and a 1956 white Coupe de Ville). This was something that the two of us usually playfully debated from a very early age, back and forth over Saturday lunch, at Autoshows and Dealer Showrooms, and everywhere else inbetween. He really was an enthusiast and I will always cherish being able to share that with him. Despite his allegiance to Ford and Mopar, Cadillac was King in his mind. It's a shame he was never really able to afford one and only owned one once. Outside of what was already mentioned I can recollect him mentioning a red Lincoln Mark IV, three Country Squire wagons, a 1965 Newport Sedan in Copper (which had a similar comical propensity for being hit as my current Impala seems to have), a 1955 Ford with a two-speed automatic (his friend had an identical 1955 Ford with the three speed manual and they once drag raced down Whyte Avenue in Edmonton at the crack of dawn to settle the debate between them of which transmission was superior- he was way quicker off the line but his buddy had the extra gear and won in the end). He also had a 1989 Tempo that was dreadful (He bought it from my great-grandmother when she hung up the keys not long after she bought it new), a 1994 Dodge Neon Sport, loaded (one of the first Neons on the road in town), a mid 1980s white Grand Marquis with blue velour interior, a 1996 Ford Windstar and a 2001 Dodge Caravan Sport. Not in any particular order, of course.