The only Little Dot uncle I can remember is the incredibly fat one -- even fatter than Little Lotta -- who couldn't get his girl to marry him because he was, well, too fat. Realizing that he can't possibly be expected to exercise or stick to a diet, Dot gets her grandmother's old corset from the attic and wraps it around her uncle's frame, making him look thin at last. The end.
I also like the line in the comments section about Richie's poor friends Freckles and Peewee:
Notice how he never once thought to slip a few quid to his poor friends, the ones who would show up wearing patched overalls and shoes with holes so big that their toes showed. Meanwhile, Richie was telling them how he was installing a jewel encrusted toilet lid along with special gold leaf toilet paper with which he would wipe his ass. Come the revolution, you can bet that Freckles and Pee-Wee will line their "pal" up against the wall and administer some proletariat vengeance.
Aux armes, citoyens de Harveyland.