Epzo's mother
From Tardis Wiki, the free Doctor Who reference
Epzo's mother was a Muxteran who at one point in her life had a son named Epzo.
When Epzo was four years old, his mother made him climb a tree and told him to jump from it, promising to catch him. However when Epzo jumped, she moved out of the way, resulting in Epzo breaking his arm and shattering his ankle. His mother then taught him not to trust anyone in his life, citing what she did as proof he could trust no one. Despite this, Epzo still loved his mum, and lived his life to her teachings years later. (TV: The Ghost Monument)