Lord Congleton's third wife, married in 1867, by whom he had his only child, a daughter Sarah Cecelia born in August, 1868.
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Tom said ...
Through Margaret, Lord Congleton had his only child, Sarah Cecilia Parnell (1868-1912). In 1895 she married a Henry Ambrose Mandeville - any relation to the Lord Mandeville of the Powerscourt Conference?