Finding the whole thing very difficult to digest. Seems Thomas Parry was son of Harry, whose name could well have been Harry Vaughan. Harry Vaughan could have been son of a Thomas Vaughan, legitimate or otherwise. Thomas Vaughan is unlikely to have been that Thomas Vaughan who was executed in 1483 because his daughter, Anne, inherited. There is no agreement as to who the parents of Thomas Vaughan were and none either as to how many Thomas Vaughans were active at the time. It is possible that Thomas Parry's mother was called Gwenllian. So glad he didn't marry Kat Astley since no one knows who her parents were, either. Good news is Wikitree should be an excellent tool for sorting it out. Only one profile per person, lots of room to explain sources, write a sourced bio, add research notes and keep the discussion in one place, providing links to everyone involved. I am ever the optimist.