It is not known if James ever married or had children.
Sources
"Illinois, Cook County, Birth Certificates, 1871-1949," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKMW-3SSS : 18 May 2016), James Joseph Coppolo, 08 Jun 1925; Chicago, Cook, Illinois, United States, reference/certificate 23865, Cook County Clerk, Cook County Courthouse, Chicago; FHL microfilm .
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KW4S-DFQ : 8 January 2021), James Coppola in household of John Coppola, Brookfield, Cook, Illinois, United States; citing enumeration district (ED) 16-255, sheet 17A, line 21, family 353, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 781.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V33N-Z53 : 9 January 2021), James J Coppola, 20 Apr 1999; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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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 ancestors' Y-chromosome or 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: