Looking for the missing links. A great uncle claimed that our family line was so. Can anyone help me prove this?

Dugald an Oir m Christian MACLENNAN
John Og m. Margaret MACKENZIE
Alexander b abt.1656 m. Catherine MACRAE
Farquhar m Margaret MACKENZIE
Donald of Balmacara1754?-? m. Marian MACDONALD emi. Cape Breton 1825
Farquhar 1805-1839 m Mary MACVICAR in Benbecula and was a teacher there
Alexander 1833-1897 m. Jeanettte JOHNSTON Woodstock, Canada
William B. S. 1873-1936 m. Elsie Mildred RICE
Ellen Jeanette 1905-1991 m. Nicholas A. SCHLANGEN