Doris Lethbridge - Stewart Doris Lethbridge - Stewart , née Doris Bryden , and Doris Wilson while married to George Wilson , was the mother of Alistair Gordon Lethbridge - Stewart ' s son Albert Wilson . She was also the stepmother of Kate Stewart and the step - grandmother of Gordon Lethbridge - Stewart . History . Doris first met Alistair at Brighton in the mid - 1960s and had a brief but passionate romance . It ended amicably when Alistair was sent overseas . Their relationship seemed to have been sexual . ( TV : " Planet of the Spiders " , COMIC : " The Warkeeper ' s Crown " ) During this time , Doris gave Alistair a watch . Later , during the time that Alistair worked with the Scots Guards , he spent a weekend with Doris . This would be their last encounter for over twenty years . ( PROSE : " The Enfolded Time " ) Major Walter Douglas was one of the few people who could get away with joking about the fling to Lethbridge - Stewart . One such joke made the Brigadier uneasy about going to Brighton with his fiancée . ( PROSE : " The Forgotten Son " ) In the early 1970s , Doris married George Wilson , the brother of Barbara Smith , Sarah Jane Smith ' s mother . Around this time , Doris had a child she named Albert Wilson ; Albert ' s father was not George , but Alistair . Doris wrote a letter to Alistair to tell him that he had a son , but she never sent it . ( PROSE : " The Enfolded Time " ) Within a few years of their marriage , George was killed in Northern Ireland . ( PROSE : " The Scales of Injustice " , " The Enfolded Time " ) In 1990 , Albert had a child of his own and contacted Alistair . Albert asked him to help raise his granddaughter . ( PROSE : " The Enfolded Time " ) Through this Alistair met Doris again and they eventually married . ( TV : " Battlefield " , PROSE : " A Romantic Evening " ) They lived in a large house in the country . She took an immediate liking to both her husband ' s latest successor , Brigadier Winifred Bambera , and to Ace McShane . ( TV : " Battlefield " ) Doris had relatives in the South West of England . In 2000 , she visited the in - law s up in Devon , while Alistair went to Lanyon Moor , officially on holiday ; unofficially , he doing under - cover work for UNIT . At this point , she and the Brigadier had also intended to go to Greece for a while . ( AUDIO : " The Spectre of Lanyon Moor " ) Doris and Alistair went sailing on their boat one Christmas when they found Susan Foreman in the middle of the water . They took her back to their house , and were surprised to find that the First Doctor came looking for her . The Doctor pretended not to know who she and Alistair were , but after Alistair left , the Doctor confided in Doris that he knew who they both were the whole time . The Doctor left shortly after this conversation , before Alistair returned . ( PROSE : " The Gift " ) She was still alive at the events surrounding the events with the Tunguska Scroll as Major Cal Kilburne claimed that the Brigadier ' s wife " let me in " . ( TV : " Enemy of the Bane " ) In 2010 , Doris and Alistair went to Luke Smith ' s second farewell party before Luke was going to the University of Oxford . ( PROSE : " The Nightmare Man " ) While they were boating in the early 2010s , the Lethbridge - Stewarts ' boat capsized and Doris drowned . His grief over this loss left the Brigadier nearly suicidal for a time , but he eventually moved on from his loss as he accepted that life was dear because it wasn ' t permanent , and that he would never sacrifice what he had with Doris simply to escape the pain he was feeling now . ( PROSE : " The Shadows of Avalon " ) A conflicting account had Doris having Christmas dinner with the Brigadier and the Eighth Doctor in 2017 . ( PROSE : " Not in My Back Yard " )