Pleased to come across someone else related to John and Marsellas Fergus. I am descended from their son Robert born 1821. You mention that they had twelve children but I have only found nine namely : John 1802, James 1804, Agnes 1806, William 1808, Hugh 1810, Barbara 1812, Margaret 1816, James 1818, Robert 1821. Do you have John's date of birth, if it is 3/7/1785 his parents are John Fergus and Isobel Lawson who married on 5/12/1777 in Dunfermline. Would you like a copy of my Fergus tree to fill some of your gaps? We are in Blyth Northumberland can I ask where you are?