Her brother was the Hon Sir Arthur Robert Guinness Kt, Speaker of the House of Representatives in New Zealand
"England and Wales Census, 1911," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XWL4-RKP : 1 August 2017), Catherine Mary Richardson in household of Fred Chs Richardson, Kensington, Kensington W, London, England; from "1911 England and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO RG 14, The National Archives of the UK, Kew, Surrey.
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It may be possible to confirm family relationships with Catherine by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Catherine: