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Twins share touching bond as genetic condition affects just one of them

A devoted mum of twins has told how, instead of noticing her daughters’ similarities, she is increasingly aware of their differences - as one has a rare genetic disease, while the other is completely healthy. Born just a minute apart, like most twins, two-year-olds Alice and Verity Castles enjoy an incredible closeness, according to their parents, barrister Charlotte and university lecturer Flynn Castles. But, born "limp and lifeless", little Alice has Prader-Willi syndrome - a rare genetic disorder that causes developmental and behavioural problems - while Verity is a lively toddler, who hits all her milestones.

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