My 7 month old son taking by his father

I have not seen my son in 20 years. His father took him after I was in a car accident and cleared my flat while I was in hospital. I really want to meet my son and see his Father to ask him for forgiveness. My son was born 30 May 1995 in Johannesburg and has been living with his dad Arthur Meliah. My sons name is Sean Appollis.