Being a Kohein, I am pretty sure that none of my forefathers married converts.
How can you be so sure? How do you know that your maternal grandmother didn’t have an ancestor who married a convert? Your being a Kohen wouldn’t preclude such a possibility? It’s not like geirus is a p’sul that is passed down the generations. There is no question, for example that the great-granddaughter of a ger can marry a kohen.
The Wolf