@peteolczyk I took a class in college that was children’s classics. Some of the books we covered were: Wizard of Oz, Anne of Green Gables, Winnie the Pooh, The Jungle Book, Peter Pan, The Wind in The Willows, The Bell Jar, Charlie and the Chocolate Factory, and several more.
I agree with @LauraA that they would be beloved books. If I was to make a short list of picture books I think a lot of people consider classics, they would include: Where the Wild Things Are by Maurice Sendak, The Snowy Day by Ezra Jack Keats, Goodnight Moonby Margaret Wise Brown, Madelineby Ludwig Bemelmanas, Curious George by H.A. Rey, and lots more.
My personal favorites also include: Jenny and the Cat Club by Esther Averil, The Ice Cream Cone Coot and other Rare Birds by Arnold Lobel, Jamberry by Bruce Degen, Olivia by Ian Falconer, and the list goes on.
Now that my mind is churning I could go on forever. There are about a million I could have added, but I think what is precious to you and your family are the ones that become classics. They are the ones that stick with you and leave their mark. I think they can be different for different people. But maybe the element that determines a “classic” is withstanding the test of time and still resonating with new readers. They are those stories that you eagerly pass on to a person and just know they will love. There have been several that I have had to wait to share until my children were old enough to understand them and then I passed the torch with giddy anticipation.
Anyway...that’s my take. I would love to hear other poeple’s classics too.