Grew up and went to school with two boys who were neighbours of my courtesy Aunt - 1960's. In the early days asked if we were related, because their mother's maiden name was the same as ours. Don't think so was the response (my father wasn't alive to answer yes or no). Years later on doing family history, two names kept jumping out at me in the tree, names I knew, but no other information, but didn't dwell on it, until one day saw the death notice of the father, a few years ago, and yes it turned out we were cousins. My great grandfather and their's were brothers.
Cheers
KHP