Adam, quick question to you about Shelia.
Do you believe she was largely sedentary, unable to make a cup of tea, beans on toast. Opinions of her from family members seem rather cruel. Even mocking her because she didn't drive. Maybe she had no desire to learn? Many don't
I see a girl who despite having mental health problems and a stay in a private clinic, was a single mother, who looked after two young boisterous happy children, who undertook cleaning work, ( doesn't matter if they fell through, she showed the gumption to turn up) an attractive girl with a lively social life.
A young woman who mocked all her life I reckon " as being slow " probably an inner family joke, and probably detrimentally wrecked her mental health. She was probably unfavourably compared against Bamber in their formative years. Despite him himself not being a high achiever. He was quick witted, reasonably smart and didn't have issues so to speak.