I need my deceased fathers tax number

How do I go about finding out what my father's tax number is? He is deceased and the executor is my grandfather and he is too old to travel as he lives in another province. I am his only living child. Is there another. Way of finding out the tax number without having the executor present as Sanlam needs it?

Phone 0800 00 7277 or have the executor call SARS with your father's details and they should be able to provide it. You could also phone his old employer who will have the details.