Many old folk are often well experienced and have had interesting lives. The ones you met, however, were just very sceptical about other people's opinions and arguements, to which they are often very opinionated themselves. However don't blame them, they could actually have seen something and your mother might not have witnessed the same incident they did. Who knows, with evidence there's always an arguement. Read the local newspaper and read what it says. You might find the answer by looking there. If the incident really was imaginary and these ladies actually think this incident did happen, then they have a good reason to think it's real. They're old.
Have a nice day.
Have a nice day.