Stepparent
Within a family, a stepparent was the spouse of a parent, but not the biological parent of the children. They might also be termed a stepmother or stepfather.
Doris Lethbridge-Stewart was Kate Stewart's stepmother. (PROSE: Lucy Wilson and the Bledoe Cadets [+]Loading...["Lucy Wilson and the Bledoe Cadets (novel)"], Acceptance, and then Understanding [+]Loading...["Acceptance, and then Understanding (short story)"])
Professor Howard Foster was an archaeologist and Peri Brown's stepfather. (TV: Planet of Fire [+]Loading...["Planet of Fire (TV story)"])
When introducing Missy to a crowd in Essex in 1138, the Twelfth Doctor introduced her as "the wicked stepmother", a barb she took in stride. (TV: The Magician's Apprentice [+]Loading...["The Magician's Apprentice (TV story)"])