Original: After Hargreaves's death in 1988, his son Adam Hargreaves began writing and illustrating new stories, including four characters that R. Hargreaves had developed before his death.
Simplified: After Hargreaves died in 1988, his son, Adam Hargreaves, began writing and illustrating new stories about the Mr. Men and Little Miss characters. He created ten new characters; four of them were inspired by work Roger Hargreaves had produced before his death.