Malta Citizenship by Descent through Grandfather

Good day everyone
.
Happy to be here.

Wanted to hear if anyone has applied for Citizenship by Descent through their grandfather (who was Malta born), even though you did not have copy of your grandfather's Marriage certificate?

My grandfather was born in Malta, but came to South Africa and got married here to my grandfather (they have both since passed)

Subsequently both my father and I were born in South Africa. (My father has since passed as well)

Am trying to apply for Citizenship by Descent, but the only document I cant seem to find (at South African Home Affairs) is my grandfather's marriage license certificate.

Why would I need to prove that my grandfather was married if I can prove (through documentation) that both my father and I are related to him?

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