I suddenly remembered Mary Plain. She was a little bear who lived in the bear pits in Bern in Switzerland. When I went to Bern in my teens, to me it was still the home of Mary Plain.
What Katy Did, mentioned by quite a few of us, was written in 1873, I think. Yet those children just leap off the page, real people, who could easily live today.
Relationship Investigations in the Digital Age: Contact Wizard Web Recovery
Cheating Spouse Concerns and Digital Evidence: Contact Wizard Web Recovery


Now A3.
I think I was hooked by the idea of a family with two sets of twins, always off on adventures. Another favourite for some reason was Tom Brown’s Schooldays.