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Sources
"United States Census, 1930," index and images, FamilySearch[1] : accessed 14 Dec 2013), Dorthy Johnston in household of Frederick Johnston, Baltimore (Districts 251-500), Baltimore (Independent City), Maryland, United States; citing enumeration district (ED) 0315, sheet , family 122, NARA microfilm publication .
"United States Census, 1940," index and images, FamilySearch[2] : accessed 14 Dec 2013), Dorothy Johnston in household of Frederick Johnston, Ward 20, Baltimore City, Baltimore City, Baltimore City, Maryland, United States; citing enumeration district (ED) 4-625, sheet 2B, family 35, NARA digital publication of T627, roll 1533.
Paternal relationship is confirmed by a 23andMe test match between Jon Couts, grandson and M. M., first cousin twice removed. Their most recent common ancestors are Frederick Johnston and Clara Martin. Predicted relationship from 23andMe: Third cousin, 73 cM across 3 segments.
Footnotes
Acknowledgments
Thank you to Jon Couts for creating Johnston-4497 on 13 Dec 13. Click the Changes tab for the details on contributions by Jon and others.
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Dorothy's formal name
full middle name (M.)
exact birthdate
birth location
exact deathdate
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private siblings' names
private children's names (4)
spouse's name and marriage information
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DNA Connections
It may be possible to confirm family relationships with Dorothy by comparing test results with other carriers of her 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 Dorothy: