Given that her parents were married in 1967, she is likely living.
Sources
Obituary for Winifred Robinson Bass: "Newspapers.com" The Times-News (Twin Falls, Idaho) Sun, Dec 23, 1984, page 14 Newspapers Clip: 136899442 (accessed 16 December 2023)
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DNA Connections
It may be possible to confirm family relationships with Leigh 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 Leigh: