Maybe suburban America in the middle of the 20th century really was paradise—a place where families were wholesome and moral, prosperity was ubiquitous but not too demonstrative, and all problems were able to be resolved. What's certain is that plenty of the literature of the period paints exactly that picture, especially books for children, and that the Happy Hollisters series is no exception.
It's a pretty appealing world the Hollister family lives in. The children are active and healthy, mom is capable and kind, and dad is a paragon of affable masculinity. Their house in Shoreham, NY is clean and spacious, and their animals have personality and intelligence. The five kiddos (the oldest is 12) enjoy solving mysteries, which they do with surprising success and some help from their folks, even when neighborhood roustabouts Joey Brill and Will Wilson get in the way.
Each of the 33 novels is easy to read and features a relatively lighthearted mystery for the kids to solve. Author Andrew Svenson (writing as Jerry West) based most of the characters in the books directly on people in his own life—his own kids, their pets, neighborhood figures, local bullies. Despite the aura of not-quite-believable shangri-la that runs through the series, there is a level of humor and realism not present in comparable series, largely due to this basis in actuality.
The Happy Hollisters series was originally commissioned by the Stratemeyer Syndicate (the folks responsible for the Bobbsey Twins, Hardy Boys, Nancy Drew, and about a bajillion others), but was entirely the creative work of Svenson. This means the books enjoy a level of continuity unachievable in any series co-authored by multiple writers.
This is by no means "classic literature" in the sense we usually use that phrase. Still, it's better than 99% of the books currently marketed to young readers, and it's better than many of the books published during the same period (1953-70). We would urge you to distribute these throughout your kids' reading diet (not all at once, certainly not as the exclusive choice), but once in awhile these can take us back to a time when fiction, at least, was far more innocent and virtuous.