“With publishing shifting a lot, there is still, I think, a huge desire to bring his kind of vivid and mischievous world into other mediums,” said the grandson, Luke Kelly, managing director of the Roald Dahl Literary Estate.

“We are really transferring from being a literary estate to being more of a story company, and that is a bit of a scary thing for some people,” he added. “That doesn’t mean that we’re not still going to think about the books as our guiding light. It just means that we’re also thinking, How do we get these amazing words and stories into kids’ bedrooms, and into their minds and imaginations, in many ways?”

Mr. Kelly said the estate donates at least 10 percent of its proceeds to charity; he would not discuss revenue specifics, saying its finances are private. He said the estate has been looking for collaborators “in the highest league of their field,” with “a touch of darkness” as well as “an understanding of the Britishness of the stories.”

Among those the estate chose in recent years: Tim Minchin, an Australian comedian and musician, who was tapped to write the score for “Matilda the Musical.” Mr. Minchin, a longtime Dahl fan who grew up on his books and has read them to his own children, said adapting Dahl is “a reasonably big challenge” that requires converting episodic stories into dramatic narratives and adding enough emotional punch to make them moving for adults as well as entertaining for children.