Looking for family

I write to ask if any of the Greek community living in Sudan can remember their family members (or the Greek Community) talking about my grandfather or his brothers Demitri, Constantine & Spyros Petmezaki.  They lived in Khartoum and had businesses in Omdurman and El Obeid between 1912 - 1946. My Grandfather and Uncles business was called SAPCO (Sudan American Produce Company) and Dem Petmezaki & Co. My Uncle Constantine (Costi) Petmezaki was the President of the El Obeid Tennis Club. Please, anyone who recognises the names or businesses, please contact me. Or if anyone knows who I could contact to ask these kinds of questions, I would truly appreciate a message. With many thanks in advance