Hello Rosemary. Thank you for contacting us. Did you know your great-grandfather's background before? We've worked quite a bit of it out now and can take it back 6 more generations back to the early 1700s at Ballamillaghyn Farm in Braddan. It's not complete yet, but getting there.
If interested in what we've compiled so far, you may contact me at egelling at shaw dot ca. Jean Corkett and Kay Clegg who write here often are (we're about 99% sure) connected to this same line and you share the same ancestors Robert Gelling the Miller and Jane Kelly md 1770 who are Stanley Tynwald Gelling's great-grandparents.