Williams syndrome: Autosomal dominant inheritance

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Abstract
Williams syndrome (WS) usually occurs sporadically. Few familial cases of Williams syndrome have been described, and those reports have often lacked photographic documentation. We describe 3 families, including a 3‐year‐old boy and his 34‐year‐old father, a 2‐year‐old girl and her 30‐year‐old mother, and a 3‐year‐old girl and her 31‐year‐old mother. None of these patients has supravalvular aortic stenosis or chromosome abnormalities. In all 3 families, the parent with Williams syndrome was diagnosed after the identification of the syndrome in the affected child.

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