A recent addition at the ARC website brought up the children's book illustrator Arthur Rackham (English, born 1867 - died 1939). They now show 30 Rackham illustrations, largely from Alice in Wonderland, but with a few from other books – Gulliver's Travels, Mother Goose, etc.

I don't see anything suggesting stories that might be similar those illustrated by your grandfather, but perhaps you'd be interested in viewing a more-or-less contemporary artist from a genre that grandpa did work in. I certainly don't intend any comparisons, just that knowing more of the genre may help you to appreciate your own relative all the more.

I suppose I could pretend to believe that searching out other artists in the same genre might offer you a chance of finding that "magic place" where all the info you want is sequestered on the web; but I don't think that's really too likely. The only "secondary reason" for posting is that this thread has brought forth a few 'catters with some interest in folk/children's illustrations and I couldn't think where else to post.

John