Slowly building up info, and interested in your comment that you can trace back to 1700. Can you confirm George's birth (about 1819)? I believe his parents were John TIBBETTS and Agnes SULFERAGE who married 28jan1819 in Glasgow. This John was born @1799 and died before between 1863 and 1872.
If you e-mail me direct at email@example.com we can share more details. I have some other TIBBETTS trees for Scotland and it would be helpful to see if they link up.