Holly Frobisher

Holly Frobisher was the daughter of John and Anna Frobisher and the younger sister of Lilly Frobisher. As with all other human children, in 2009, the 456 used her to convey messages while in a trance. (TV: Children of Earth: Day One) John found out that the Prime Minister was planning to take Lilly and Holly to the 456. He shot his daughters and wife and committed suicide.

Biography from the TARDIS Data Core article, licensed under CC-BY-SA