Joan Gillies's DNA has been tested for genealogical purposes. It may be possible to confirm family relationships by comparing test results with Joan or other carriers of her ancestors' mitochondrial DNA.
Mitochondrial DNA test-takers in the direct maternal line:
Joan (McMahon) Gillies:
Family Tree DNA mtDNA Test Full Sequence, haplogroup H, FTDNA kit #440980
It is likely that these autosomal DNA test-takers will share DNA with Joan: