Do we have a source for the 3 August 1690 birthdate? FFYP has a 27 May 1691 baptism doc: "Jsia, zoon van Willem Nel de Moeder Jannetie, jis dedoopt de 27 Maij 1691 als getuijgen Jan De Plessis en [. . .]" http://www.e-family.co.za/ffy/e629.htm
but no birth date?
And then the question of whether he is born 4th or 5th.