"Massachusetts Births, 1841-1915," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FXVT-SHV : 1 March 2016), John Joseph Mullen, 14 Dec 1913, Boston, Essex, Massachusetts; citing reference ID #Page 389 No.17475, Massachusetts Archives, Boston; FHL microfilm 2,409,799.
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DNA Connections
It may be possible to confirm family relationships with John 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 John: