The 1920 US Federal Census lists Jane as the daughter of John and Grace Howes, along with their oldest child, Paul. Presumably, since Jane is not included with the family in the 1930 Federal Census, she may have passed away before then. 
↑ "United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXBT-PGZ : accessed 3 September 2018), Jane Howes in household of John W Howes, Everett Ward 6, Middlesex, Massachusetts, United States; citing ED 144, sheet 9B, line 100, family 204, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 710; FHL microfilm 1,820,710.
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It may be possible to confirm family relationships with Jane by comparing test results with other carriers of her ancestors' 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 some percentage of DNA with Jane: