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Okay, I have another one. Children's chapter book about a mouse whose mother had eaten some kind of vitamin or growth supplement while pregnant with him, so he became giant. His dad's name was Marcus Aurelius (!) and the title of the book I'm pretty sure was the giant mouse's name, but I can't remember it at all. Um. I think at one point one of his parents gets trapped in a mousetrap and he saves them.

Never mind, I remember: it was "Magnus, Powermouse".