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DNA Connections
It may be possible to confirm family relationships with Sydney 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 Sydney:
UNKNOWN-273596 and Porter-7418 appear to represent the same person because: I am so sorry I did not notice the "half's before now - Sydney Porter Upton and Sydney Unknown are the same individual.