Ronald McDonald and Flora Thompson married on 28 Feb 1900 in Nottawasaga, Simcoe, Ontario, Canada. He was 40 years old at the time and she was 27. Ronald was born around 1860 and he was the son of Allan McDonald and Flora Patterson. Flora was born around 1873 and she was the daughter of David Thompson and Charlotte Ross.
"Ontario Marriages, 1869-1927," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KZB8-1PN : 11 March 2018), Ronald Mcdonald and Flora Thompson, 28 Feb 1900; citing registration , Nottawasaga, Simcoe, Ontario, Canada, Archives of Ontario, Toronto; FHL microfilm 1,871,078.
It may be possible to confirm family relationships with Flora 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 DNA with Flora: