corlet entries in the IGI are often purely imaginary - I've seen entries copied from one father's name to another, wives names (which were not in the original reg) added often erroneously as well as mistranscribed dates (even at times a century out) - unfortuneately someone, I presume mormon, managed to replace most corlet entries with patron submitted - some are correct but you cannot tell which - I've only looked at detail in Ballaugh (which I think is the worst affected parish) but I suspect the same nonsense carried out in other parishes - you need to look both at wills and land records