Don't know how old the kids are, but you could look into Hardy Boys/Nancy drew books. Encyclopedia brown. The Little House on the Prairie books are good as well, even for boys (just skip a chapter here or there for the boys).
The Yearling, Old Yeller, Huckleberry Finn & Tom Sawyer
I forgot about encyclopedia brown! That was my shit.
Also this: https://www.goodreads.com/series/108406-blart. Blart: The Boy Who Didn’t Want To Save The World. (Plot spoiler: he does). This is a series that any boy would enjoy reading.
Also the Tom Swift series
the English version would be "The Famous Five",
and maybe a bit more English centric, "Jennings"
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