Which Tolkien child edited and published The Silmarillion after his father’s death?

Christopher Tolkien edited and published The Silmarillion after his father’s death.

J.R.R. Tolkien died in 1973, leaving behind a vast collection of notes, drafts, and versions covering the history of his fictional world. Christopher Tolkien worked through this material and arranged it into a publishable form. The Silmarillion appeared in 1977, four years after his father’s death.

The book presents myths and histories from the creation of the world through the First Age and later events. Because Tolkien had revised these stories repeatedly, Christopher had to make editorial decisions about ordering, wording, and consistency. He also added explanatory editorial material in later publications.

Christopher was Tolkien’s third son and became the principal literary executor of his father’s unpublished writings. He later edited many additional volumes, including The History of Middle-earth. His role was editorial rather than that of a co-author who independently invented the published mythology.