↑[1]Ferreira Families Janet Melville & Emmarentia S Ferreira; Des 2015. ISBN 0-86988-727-0. p172. Bygevoeg deur André Ferreira 2 May 2020
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DNA Connections
It may be possible to confirm family relationships with Petrus Johannes Frederik by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Petrus Johannes Frederik: