What was the name of Tolkien’s youngest child, who helped edit his papers?

Tolkien’s youngest child was Priscilla Tolkien.

Priscilla Tolkien was born on 18 June 1929, the fourth and youngest child of J.R.R. Tolkien and Edith Tolkien. Her older siblings were John, Michael, and Christopher. She later worked as a social worker and remained involved in preserving and discussing aspects of her father’s life and work.

Priscilla helped Christopher Tolkien with editorial and family matters connected to their father’s papers. Christopher became the better-known literary editor, preparing The Silmarillion and numerous posthumous volumes, but Tolkien’s children collectively formed an important link to the author’s manuscripts, correspondence, and personal history.

Priscilla’s name is sometimes confused with Christopher’s because both were associated with Tolkien’s literary legacy. She was not the editor of The Silmarillion; that role is principally credited to Christopher Tolkien. Priscilla died in 2022, aged 93, after a lifetime connected to her father’s family and cultural legacy.