Not nearly so interesting as lots of the previous stories, but my mother assured me that her fathers family were wealthy Irish coal merchants. Sorry, mum, your dads family lived briefly in Wales, and all came from Bristol, England. I do have some Welsh ancestry, but it's through my father, not my mum.
Even after being shown my research, with birth records and census records to back it up, she still maintains that "we must be Irish somewhere along the line." My husband, who is of Irish descent, said, in a somewhat earthy way, "the only Irish your lot have is the bit I put into you!"
Sorry! I'll get me coat now!