You're posting on the QUINN surname board.
Did this line change (or have it changed for them) their surname to Quinn?
Surname changes and variants are extremely common, you'll find more answers *why* by learning the basics of genealogy research. You can check out Ancestry Academy under EXTRAS and choose a video to watch and learn. There are also books on *how to* genealogy at your local library, and websites which can help you learn the basics.