Letitia "Tish" Jones is the daughter of Francine Jones and Clive Jones, the older sister of Martha Jones and Leo Jones, and the aunt of Keisha Jones.She was also cousin of the late Adeola Oshodi.
Tish witnessed the Royal Hope Hospital disappear, and later attended her brother's birthday party. (DW: Smith and Jones)
She then became the head of PR for Richard Lazarus,who made himself look 40 years younger. After the experiment he seduced Tish on the roof of his lab where he turned into a monster that tried to kill her. Fortunately Martha and The Doctor arrived in time to save her. After everyone had evacuated the lab, he escaped to a cathedral where he chased Martha and Tish to the top of the tower and tried to kill them but the Doctor saved them by killing the mutated form of Lazarus with soundwaves. (DW: The Lazarus Experiment)
She then began to work for Harold Saxon when he became Prime Minister and was later arrested along with her parents. (DW: The Sound of Drums)