Location: Port Louis, Mauritius

Surnames/tags: Julie Affair Creole
Would like to ask for assistance. At a dead end here. My grandfather was the result of an affair and his real father's name was never mentioned. Is there any possible way or technique to try work around such a dilemma? All of this took place in Port-Louis, Mauritius and my family are of French, Creole and British decent.
His mother's name was "Louise Cécile Laure Geffroy" born 20 SEP 1920 • Grande Riviere, Mauritius (my great grandmother) and her first marriage was to "Joseph Louis Julie" born 10 AUG 1910 • Mauritius. She then married common law to a "Cassam Sulliman" and finally her last marriage was to a "Joseph Charles Philippe Ducasse." She passed away 18 MAY 2012 • Johannesburg, Gauteng, South Africa.
She had an affair with an unknown man while married to "Joseph Louis Julie" around 1938 and as a result "Joseph Maurice Julie," my grandfather, was born. He was registered as "Julie" and "Joseph Louis Julie" was added as his father on his birth certificate but this is not true. How do I find out who this secret lover is, who my real great grandfather is?
We know that the man which "Louise Cécile Laure Geffroy" eloped with while married to "Joseph Louis Julie" might very well be of Creole decent but how on earth do we find out and where do we begin?
Maybe somebody here finds interest and will be willing to assist. Any advice is welcomed!
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