Genealogies of Old Cape Families, by C.C.de Villiers, revised, augmented and rewritten by C.Pama, A.A.Balkema, Cape Town, 1966. The original edition of 1894, compiled by G.M. Theal from the work of C.C. de Villiers Vol 3 Snijman p314 (www.eggsa.org/links). Added by Alta Bekker Dec 1, 2015.
It may be possible to confirm family relationships with Gerrit 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 Gerrit: