Rita-Anne Smith (Pete's World)

In the real world Mickey's grandmother broke her neck after tripping on the carpet Mickey forgot to fix (DW: The Age of Steel). However on the parallel Earth dubbed Pete's World, Rita-Anne was still alive, and the grandmother of Mickey's doppleganger, Ricky Smith. Rita-Anne had a tense relationship with her grandson, as she did not approve of his running off with the Preachers. When the Cybus Cybermen began to summon the humans for upgrades, she was one of the people who was summoned, but she was not upgraded. The death of Ricky Smith left her with no one to take care of her, which was a major deciding factor in Mickey Smith deciding to stay on Pete's World. (DW: The Age of Steel)

Rita-Anne came to live with Mickey, who took up residence with Pete Tyler, Jackie Tyler and Rose Tyler in a mansion, where she eventually passed away peacefully. Just as her survival helped Mickey decide to stay on Pete's World, her death ultimately inspired him to return to his original Earth when the opportunity arose (DW: Journey's End).