Mary Cooper
Mary Cooper was born some time prior to 1947. She married Geraint Cooper, and the two would have a daughter, Gwen Cooper. Through her daughter Gwen, Mary would eventually become the mother-in-law of Rhys Williams and grandmother of Anwen Williams.
Biography
In her encounter with the quantum transducer, Gwen used the ghost machine to instigate a flashback of her and Rhys leaving to attend Mary's 60th birthday party. (TW: Ghost Machine)
At the time of her daughter's wedding she was living in Swansea. Mary attended Gwen's wedding. After seeing Gwen, who unbeknownst to Mary was actually impregnated by a Nostrovite, Mary was happy at the prospect of a grandchild - particularly because she believed it would shock Brenda. Although Mary was not privy to the nature of Gwen's job, she was caught up in the adventure when she was threatened by the Nostrovite who had assumed the guise of Brenda. Despite Gwen and Rhys proclaiming that they would not keep secrets from each other in their marriage, Mary's memories -like those of the other wedding guests - were erased by Jack Harkness. Mary forgot about the whole ordeal, which her daughter felt to be "for the best". She was last seen sleeping against Brenda - perhaps an indication that the two would manage to put aside their differences. (TW: Something Borrowed)
During the Dalek invasion of Earth, Gwen told Rhys tell Mary to take her pills and go to sleep. (DW: The Stolen Earth) When investigating a man connected to the 456 going by the alias "Timothy White"; Gwen commented that her mother used to shop there. (TW: Children of Earth: Day One)
At some point prior to Miracle Day, Gwen informed Mary of the true nature of her job. On Miracle Day, Mary accompanied her husband to the hospital after he had had a heart attack, and met her daughter, son in law, and - for the first time since Anwen was born - her grandaughter. (TW: The New World)
Personality
Mary was a somewhat snobbish, middle class woman. She enjoyed nagging her husband Geraint and scoring points against Rhys' Mum, Brenda Williams. (TW: Something Borrowed) She would later tease Gwen about her 'frugal' lifestyle, asking her if she'd been feeding her daughter lard. (TW: The New World)
