Willem Hendrik was die seun van Johannes Mattheus van der Westhuizen en Anna Margaretha Elizabeth Olivier.
Sy naam kom voor in hulle pa se sterfkennis van 1883.
Uit hulle ma se sterfkennis van 1898:
(https://www.wikitree.com/photo.php/2/28/Olivier-1276.jpg)
eGGSA library Gravestones in South Africa Weskaap : Western Cape Western
Cape, GEORGE district, Rural (farm cemeteries) Western Cape, GEORGE district,
Zebra, Welbedag 24, farm cemetery WESTHUYSEN Willem H., v.d. 1862-1916