Very little record of Berdie. It is believed Maud gave her up as she did her son Samuel Porter.
Sources
Personal Memory of PM Knight-3405
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DNA Connections
It may be possible to confirm family relationships with Birdie 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 some percentage of DNA with Birdie: