Harriet is the biological mother of Sylver McQueen and the wife of the late Wes. Harriet walked out on Wes and Sylver when Sylver was 3 years old. In December 2018, Sylver found out from his adoptive mother Breda McQueen that he was adopted after his mum, Harriet, walked out on him and his father, Wes, died (having actually murdered by Breda).
Not long afterwards, Sylver decided to track down Harriet and found an old photo album. Breda found a photo but hid it from Sylver. However, Sylver's adoptive sister Goldie McQueen saw this and stole the photo back. With the help of Mercedes McQueen, they found out that Harriet was living in Buckthorn Nursing Home only an hour away and told Sylver.
The next day, Sylver visited Harriet with Mercedes but she didn't recognise Sylver. They later found out from a nurse that Harriet had dementia, which left Sylver heartbroken. Sylver showed Harriet the photo of him when he was a child, hoping it would help her remember, but she still didn't recognise him. Breda arrived as Sylver left and Sylver became mad at her for not telling him about Harriet before the dementia, as he's now nothing to her. Harriet recognised Breda and was visibly scared of her, which Mercedes noticed.