It may be possible to confirm family relationships by comparing test results with Catherine or other carriers of her ancestors' mitochondrial DNA.
Mitochondrial DNA test-takers in the direct maternal line:
Catherine (Willhite) V:
Family Tree DNA mtDNA Test HVR1 and HVR2, haplogroup J1c5a, FTDNA kit #387423
It is likely that these autosomal DNA test-takers will share DNA with Catherine: