Leo Jones

Leo Jones was the brother of Martha Jones.

Childhood
Leo was born to Clive and Francine Jones in 1987. (TV: Smith and Jones) As a child, he loved to read Commando comics (PROSE: The Story of Martha) and used to steal the tennis ball when his elder sisters, Tish and Martha, were playing in the garden. (PROSE: Wishing Well)

Circa 1990, Leo was responsible for breaking Martha's arm after he accidentally pushed her too hard on a park swing. Although Martha was the one with the injury, Leo was the one who ended up crying about it. (PROSE: The Frozen Wastes) He and Tish once buried Martha up to her neck in sand at Cromer Beach. (PROSE: Forever Autumn)

Adulthood
By 2008, Leo and his girlfriend had a two-year-old daughter named Keisha. (PROSE: Martha Jones' MySpace blog) He did not ask for a twenty-first birthday party and told Martha that he would rather not have one than have Clive and Francine arguing. Annalise bought him a 75p soap. The party ended in a fight, after which Leo went after his father whilst Tish stayed with their mother. (TV: Smith and Jones)

Leo witnessed Richard Lazarus turn forty years younger and the havoc that Lazarus created when he mutated and began a feeding frenzy to power his rejuvenation, during which he was struck in the head with a table and suffered a concussion. He also met the Tenth Doctor, who he could tell his sister loved dearly. (TV: The Lazarus Experiment)

On the day Harold Saxon took office, Leo was in Brighton with his girlfriend and daughter. had his parents and sister arrested, but Leo evaded capture after Martha warned him to hide with friends. (TV: The Sound of Drums) Following the The Year That Never Was, Leo was back with the rest of his family as the only one without memory of the Toclafane invasion and its aftermath. (TV: Last of the Time Lords)

In 2009, the Doctor asked Martha how her family was. She told him that they were "not so bad". (TV: The Sontaran Stratagem)

Personality
Leo hated the song "Grace Kelly" by Mika (PROSE: The Pirate Loop) and did not dress smartly, with Martha implying that seeing him in black tie was a novelty. (TV: The Lazarus Experiment)

Behind the scenes

 * In an unmade, deleted scene, Tom Milligan found Leo during the Master's reign. He told Martha that Leo was part of the slave force in the north and had had to change his name because he could not risk having anything to do with her.