Thanks for your request for a Book Match. This happens to be one of my favorite books, too. If you like this one, you might enjoy other books by Kevin Henkes. Lilly is also a character in "Julius, The Baby Of The World" (Lilly is convinced that the arrival of her new baby brother is the worst thing that has happened in their house, until Cousin Garland comes to visit.). Another character he writes about is Wemberley.
I'm glad you asked for a Book Match. Here are some books I think you will like:
Frog and Toad books by Arnold Lobel
George and Martha books by Marshall
Amelia Bedelia books by Peggy Parish
All of these have lots of stories about the same characters.
You might also like My Little Sister Ate One Hare by Grossman, What?
Cried Granny by Lum and The Red Racer by Wood.
Thanks for your request for a Book Match. If you want to read some looong books like Belle Prater's Boy, here are some suggestions:
The Same Stuff as Stars by Katherine Paterson. When Angel's self-absorbed mother leaves her and her younger brother with their poor great-grandmother, the eleven-year-old girl worries not only about her mother and brother, her imprisoned father, the frail old woman, but also about a mysterious man who begins sharing with her the wonder of the stars. Other books by this author that you might enjoy include The Great Gilly Hopkins and Flip-Flop Girl.
If you're a beginning reader who likes to read series books, here are a couple suggestions. Each title is the first in the series.
26 Fairmount Avenue by Tomie DePaola. The true-life adventures of the famous children's book author, including dropping out of school on the first day of kindergarten.
Catwings by Ursula K. Le Guin. Do those kittens really have wings?
McBroom Tells a Lie by Sid Fleischman. Josh McBroom, his dear wife, and their eleven children outwit mean Heck Jones by using frozen sunlight and a car that runs on popcorn.
If you like longish books, here are some suggestions.
All-of-a-Kind Family by Sydney Taylor. Five sisters living on New York's Lower East Side in 1912 get a big surprise when their mother has a new baby.
Cougar by Helen V. Griffith. Is that really the ghost of a horse that Nickel sees?
Dog Friday by Hilary McKay. Who would have thought that a boy who's been attacked by a dog would actually hope that he could adopt the stray dog he found on the beach?
If you like fantasy and family stories, here are some other titles you might enjoy.
Among the Hidden by Margaret Peterson Haddix.
In a future where the Population Police enforce the law limiting a family to only two children, Luke has lived all his twelve years in isolation and fear on his family's farm, until another "third" convinces him that the government is wrong.