This is driving me nuts, we read it at school (Year 7) and I've always thought it was called Cannery Row. I've just read Steinbeck's Cannery Row and of course it's not the same book at all!
Anyway, this family had a few kids, think the eldest boy was called Val, the clever daughter passed her 11+ and they were hard-pushed to pay for her school uniform, mum has an operation and somebody knits her a bedjacket, they go to a travelling fair.
Any ideas?