According to Elinor Warneke (nee Lees), Marmion had a twin brother, Marmaduke, who died soon after birth. This has not been confirmed.
Marmion died as an infant.
Sources
Family Records
"England and Wales Birth Registration Index, 1837-2008," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2XL9-JH8 : 1 October 2014), Marmion Haldane Lees, 1884; from "England & Wales Births, 1837-2006," database, findmypast (http://www.findmypast.com : 2012); citing Birth Registration, Brentford, Middlesex, England, citing General Register Office, Southport, England.
"England and Wales Death Registration Index 1837-2007," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2J81-3B8 : 31 December 2014), Marmion Haldane Lees, 1885; from "England & Wales Deaths, 1837-2006," database, findmypast (http://www.findmypast.com : 2012); citing Death, Brentford, Middlesex, England, General Register Office, Southport, England.
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