Granny Two

From Tardis Wiki, the free Doctor Who reference

According to the Thirteenth Doctor, Granny Two was one of the Doctor's seven grandmothers. As the Doctor told Yasmin Khan, Granny Five claimed that Granny Two was a secret agent for the Zygons. (TV: It Takes You Away)

By the time following the Last Great Time War, the Ninth Doctor believed that his whole family, (TV: Father's Day, The Empty Child) and therefore Granny Two, (TV: It Takes You Away) had died. (TV: Father's Day, The Empty Child) Similarly, the Thirteenth Doctor stated that her entire family was dead. (TV: The Woman Who Fell to Earth)