He was married with 3 children when he filled out a registration card for WW1 in 1918 - could be the George Gillis married to Mary (Carney) with three children in 1920. Mary was living without George in 1930.
Could be the George Gillis who died in New York on 31 Jan 1948.
Sources
Papers relating to the Gillis and Ellis Families of Prince Edward Island by William Ellis Gillis
Ancestry.com. U.S., World War II Draft Registration Cards, 1942 [database on-line]. Lehi, UT, USA: Ancestry.com Operations, Inc., 2010.
Ancestry.com. U.S., Social Security Applications and Claims Index, 1936-2007 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2015.
Ancestry.com. New York, New York, Death Index, 1862-1948 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2014.
Find A Grave Memorial# 172620957 - this could be his family?
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DNA Connections
It may be possible to confirm family relationships with Ernest 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 Ernest: