Hame's mother, as well as her father, was made homeless when the Mechanical Wars swept across the Western arm of the Spiral conflagration. She gave birth to a litter of 16 in the middle of battle beneath the sky on fire. Hame was the youngest in the litter. The kittens were starving, so Hame's mother and father sold her to the the Sisters of Plenitude for 10 shillings in order to afford the last shuttle out of Restitution.
Later, the Tenth Doctor located Hame's parents and sent them to find her. They asked for forgiveness, but Hame assured them there was nothing to forgive. (WC: The Secret of Novice Hame)