Unfortunately, I don't think fiction is that great at this, but John Steinbeck has to be my pick. Grapes of Wrath is easily one of the best books I've ever read
I second Grapes of Wrath. Just recently read it for the first time and the parallels of what's happening now are 
I read Grapes of Wrath a few years ago after enjoying Of Mice and Men from school. I'm not bad with reading but I wasn't sure how far I'd get with the thickness of it, then I finished it real quickly.
But it was a gripping book and is certainly upfront about the problems of capitalism. If your family is that politically illiterate then it may fly under the radar, as Steinbeck doesn't use explicit capitalism/communism terminology, just more a factual description of what people/systems of people are doing.
Well I think that's the best way to do it. It's up front about issues, there is no language to abstract what is actually happening in that book and I think that's what sells it.
Maybe The Dispossessed?
I second this, this book put my teenage ass on the path to anarchism
Same here. Just an excellent, unflinching look at the benefits and drawbacks of living in a very, very different way than we do. It's really eye-opening if all you know about anarchism is what you've gotten from pop culture.
it is the best book I know of for showing what living in an alternative to capitalism could be like
I agree. not fluffy romanticization, just a plain, often harsh existence but shown in clear contrast with the excesses of capitalism. send me to Anarres now.
A Bug’s Life
first of all be a lil nicer to them, they're your family and you're grown ups.
second of all philip k dick is the answer. no guarantees it will radicalize them, but it'll limber up their gray matter.
Maybe some Kim Stanley Robinson?
Yes or Iain m banks if they like sci-fi
What's wrong with reading Vonnegut 
and not knowing who 
was is just normal. Most people can't name an unsuccessful politician from 100 years ago.
I don't think any text will do what you're hoping, that kind of progress is usually made through conversation. But I'd recommend George Saunders' In Persuasion Nation (2006), which is a short story collection about cranked up capitalist inconsistencies. He's a lib but he's got a good radar for the savage idiocy of a society under late stage capitalism.
Alternatively I might suggest The Fever (1991) by Wallace Shawn.
Based Grand Nagus.
Is he a reader who will read on his own? Can you show em steinbeck simply because he's a great American writer? Like don't show him "grapes of wrath" but maybe "tortilla flat" or "east of eden" and see if he comes back for more.
The Jungle is like the opposite of a fun read so it might not be good for this purpose, but the Fun Trivia Fact that everyone utterly fucking missed the point really got under my skin and was a seed of my own leftward move. The idea that this story had such a huge real life impact but in a way that didn't address the actual point of the story at all was super memorable but also non-threatening at the time, it was just a fun bit of american history trivia.
maybe some china mieville? bas-lag trilogy is weird fantasy steampunk on the surface, might fly under the radar.
I've heard good things about Steinbeck's In Dubious Battle, which is about labor action
Foundation by Isaac Asimov
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