A lot of tourists arriving in Derry (especially American pensioners, no offence) ask locals things like 'I think I'm directly related to Paddy Doherty, do you know him?'. Have you got ANY idea how many people in Derry are called Paddy Doherty?!? There's hundreds - lol. Depending on who you ask you will provide very good entertainment for some locals - they'll have a great time taking the 'mickey', and obviously they will be related - or so they tell you! If you're really interested in tracing your roots then head to the Genealogy Centre. They provide a fee-paying research service with a massive database on people in the Derry and Inishowen peninsula.