There is another book by the same author with GT content, but it's only tangentially relevant to our topic. I don't have the full book, only a couple illustrations. The book is called
Geshka the Pet, it is about a boy who is rather careless in taking care of his small pets, and one day their positions get reversed. The boy ends up in a cage, and giant anthropomorphic animals start playing with him. The two giant mice are implied to be kids - brother and sister - but that is not clear.

