We stayed with Granny and Grandpa for a week in summer (middle of harvest, my parents were probably mightily relieved to be rid of us for a bit.) Other than that, we only usually saw them at Christmas and Easter. We always went for the same books, and they are indelibly marked in my memory as being associated with my grandparents, and I can still quote bits of them after all these years, and I read quite a bit of poetry because of them. Their house was full of books, and I am sat here across from some of their bookcases and books (adult ones, though - not the ones from my childhood, as they went to someone else.)
We read "the Owl and the Pussycat", and all the rest of Lear's Nonsense Songs. It was an illustrated edition from my grandmother's own childhood. It was the poem I learnt for my Brownie's Booklover's badge when I was old enough for that, and I still sometimes get it as an earworm - I was quietly reciting it to myself as I was walking down the corridor at work the other day.
We also had Robert Louis Stevenson's A Child's Garden of Verses, "faster than fairies, faster than witches." Hilaire Belloc's Cautionary Tales. Kipling's Just So Stories, "O my Best Beloved".
We also had various library books - one was a modern illustrated version of "Moses supposes his toeses are roses," which I didn't realise was from Singing in the Rain until I was an adult. There were other things as well, especially once we were old enough to read ourselves (like the Girl's Own Annual from about 1904.) But I don't remember all of them.
But best of all was Struwwelpeter. Nothing like a bit of Victorian terror. Cruel Frederick, whose dog was called Tray, which seemed a very odd choice of name for a god to me. Harriet who played with matches, and the crying cats. Johnny-Head-In-the-Air who fell in the canal, the great Agrippa and his ink-pot, the boy who wouldn't eat his soup and starved to death. And recently, someone sent me a link of an animated version of the Suck-a-Thumb story, and it's even worse animated. I'm in my 40s, and it still terrified me. I notice someone has linked to a picture upthread.
I have, of course, turned out to be totally normal. Ahem.