Susan Foreman was the granddaughter of the First Doctor.
While in London, 1900, Susan tried to save children from being captured by Soul Pirates. She ended being captured herself, but thanks to her grandfather, she escaped their grasp alive. In this time she also visited Aldridge. (A Big Hand for the Doctor)
Susan had a loving side to her character. She showed this while in Hyde Park as she tried to save children from terrible criminals, despite ignoring her grandfather's orders. (A Big Hand for the Doctor)