Tim and Kathy Keller mention it in The Meaning of Marriage:
As a girl of twelve, Kathy wrote to C. S. Lewis and received answers from him, which she taped to the inside covers of her copies of the Narnia Chronicles. His four letters to her (to “Kathy Kristy”) can be found in his Letters to Children and the third volume of Letters of C. S. Lewis. (p. 245, note 2)
C. S. Lewis wrote his third and fourth letters to Kathy less than a month before he died.
Lewis’s letters are fun and instructive to read. They are filled with his typical wit, and Lewis models how adults should treat children with respect.
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