Pieter Retief was die seun van Phillippus Albertus von Wielligh en Anna Susanna Malherbe.
Uit hulle ma se sterfkennis van 1912:
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eGGSA library Gravestones in South Africa Gauteng Gauteng, PRETORIA, Urban area Gauteng, Pretoria, PRETORIA-WEST Gauteng, Pretoria, PRETORIA-WEST, Rebecca Street, Cemetery