Tish Jones

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.

Biography
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, just as he was about to transform into a lifeforce-draining monster.

Fortunately Martha and the Tenth 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. The fact was he only hired her so that he could get to Martha. When Martha, the Doctor and Jack Harkness went on the run, Tish, along with her mother and father, were captured and brought to the Valiant. There, they witnessed the Toclafane invasion of Earth.

One year later, Tish was working on the Valiant as a slave with her mum and dad. She and her family tried to break out and stop the Master but they failed at each attemped. She and the rest of her family were present when Martha was brought onto the Valiant, and the Doctor used the Psychic power of the entire world to restore himself and defeat the Master.

Following the destruction of the Paradox machine, and subsequent reversal of time, Tish and the rest of the Jones family were among the few who remembered the events of The Year That Never Was. (DW: The Sound of Drums / Last of the Time Lords)

Alternate Timeline
She was on TV when the Royal Hope vanished to the moon on Donna's parallel world. (DW: Turn Left)