The fullcircle magazine link proves that Dr Copley is Sharlto's brother's father and therefore also Sharlto's father - unless their mother remarried to another person also called Copley - which is extremely unlikely.  This magazine archives some of it's articles in the form of image files, which does not invalidate it as a reliable source.  Visit their homepage www.fullcirclemag.co.za to see what the magazine is about and why it is an independent and reliable resource.