Great evening to all were does one go to see whether my dad's reception was done as regulation requires

Great evening to all were does one go to see whether my dad's reception was done as regulation requires .We realize that my grandparents raised him since a child of multi month old ,he was raised with my grandparents Surname ,however my dad and his folks has as of now passed away.he was brought into the world in the Northern-cape keimoes and brought up in Capetown was it legitimately settle or is he not lawfully adopeded by perents. Or on the other hand he is taken on by perents .were to go what do,and in the event that I'll discover a few records or archives of any kind of assist I'll with appreciating so much thank you kindly for time