It's a programme based on the Jackson family, which isn't a series but a one-off. It shows the events that normally occur in their lives (the mum, 1 AS boy, 2 autistic boys, 1 AS/ADHD boy and 3 NT girls). It shows a year has passed - and symbolises that the boys will never change their way of thinking.
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If the phrase "you are what you eat" is correct, technically we must all be cannibals.