The titles of the earliest English editions, as far as I've been able to find out by browsing online library catalogues (hey - it's Saturday night!), use phrases such as "from the collection of", or "from oral tradition". That's in the 1820s, and the pair are referred to as "MM. Grimm". (Why French rather than German, I'm not sure.) Around mid-century the phrase "Brothers Grimm" appears, but in the 1890s we start getting books with "Grimm's" in the title, almost without exception in the singular, even when the subtitle makes it clear that there are two of them. E.g. in 1890: Grimm's Kinder- und Hausmärchen. Being a selection of the choicest fairy tales by the Brothers Grimm. With explanatory notes by W. J. Hickie. In that case, Jacob is listed as the "main author" in the catalogue. It's odd.
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