Hilda Schofield

Hilda Schofield was the mother of Cassandra Schofield and the grandmother of Seventh Doctor companion Hex. (AUDIO: Project: Destiny)

Biography
Hilda took care of Hex alongside Hex's father. Hex believed her to be his mother until he was six. (AUDIO: Night Thoughts)

The Seventh Doctor came to visit Hilda to inform her of Hex's death. While she initially accused the Doctor of letting Hex die, she eventually grew to accept it. (AUDIO: Afterlife)