Again, John L. Sullivan had only one sister, Annie Sullivan Lennon, who was my great grandmother.
I would really like to see someone on here post their proven family tree to show the connection to John L. So far, in twenty years of research, I've not seen it. It is very common that any Irish descendant has been told they are related to the Great John L. Why not? He was the first great American sports hero and worshipped by the Irish-American community. But, more than likely, what has been passed down through families has been hearsay--but I am open to finding a cousin who can prove it.