In 1905 he adopted the surname of Kerr-Smiley, and the same year married Maud Simpson, daughter of Ernest L. Simpson, a British shipbroker, and sister of Ernest Aldrich Simpson, a significant figure in the 1936 Abdication Crisis. They had two children:
Cyril Hugh Kerr-Smiley (1906–1980; married Agnes Sorell-Cameron)
Elizabeth Maud Kerr-Smiley (1907–2006; married architectural historian Christopher Hussey)
He was elected for North Antrim in January 1910 and represented the constituency until 1922, in its 1950 recreation a constituency much later achieving significant prominence for decades by its MP the Rev. Dr. Ian Paisley.
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