1901 census: living with mother, uncle William, siblings, in Kingsand, age 7
1911 census: living with grandmother Emma, mother Jane, siblings, and uncle George; age 17, named as St Lucia West Indies Resident
Sources
"England and Wales Census, 1901," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XSHW-Z3Y : 8 April 2016), James B Lomas in household of Jane A Lomas, Maker, Cornwall, England; from "1901 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing Antony subdistrict, PRO RG 13, The National Archives, Kew, Surrey.
"England and Wales Census, 1911," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:X7L2-GBM : 21 December 2018), B Avery in household of Lomas, Maker, Kingsand, Cornwall, 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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DNA Connections
It may be possible to confirm family relationships with James by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with James: