Jack Harkness's mother

Javic Piotr Thane's (AUDIO: Month 25) mother lived on the Boeshane Peninsula with her husband, Franklin, and their two sons, Javic (later the immortal Jack Harkness) and Gray.

Biography
Following the attack by the "worst creatures in existence," she and Javic were the only survivors in their family; Gray was captured after Javic accidentally let go of his hand, and Franklin was killed by the creatures, with Javic returning home to find his mother cradling Franklin's corpse. (TV: Adam) Silas later showed Jack his mother, and Jack recalled her anger over his father's passing. (PROSE: The Man Who Dreamed of Stars)

Jack later implied in a conversation with Esther Drummond that he did not know what had happened to his mother, suggesting that she was still alive when he left his time frame. (TV: The Categories of Life)