Reuben (Shroud of Sorrow)

Reuben was an old friend of Clara Oswald's family. Clara tended to refer to him as "Uncle Reuben", though he didn't share any connections, through marriage or blood, to her family. He died at some point, but Clara still had fond memories of him. The Shroud used this connection to cause grief to Clara. (PROSE: Shroud of Sorrow)