Mum (The Zentrabot Invasion)

Mum was the mother of Danny and Abby. When Abby was taken hostage by the Zentrabots on Christmas, Mum and Dad saw Danny enter the TARDIS with the Eleventh Doctor. Later on, once the Doctor freed Abby and the other children taken by the Zentrabots, Danny and Abby reunited with their parents. (COMIC: The Zentrabot Invasion)

The Doctor then took Danny and Abby for another trip in the TARDIS, promising their parents they'd only be away for five minutes. (COMIC: The Tomb of Shemura)