I thought I would reply since I also have a great-great grandfather named Thomas born 1930 to William Boag and Elizabeth Russell. He married Catherine Steel Henderson and had 4 sons William, George, John, and Thomas. My greatgrandfather was John who was born about 1864, married Catherine Henderson and had 4 children named Thomas, John, George and Katherine. My grandfather was George born 1898, married Henrietta Horsburgh, came to Canada and had 3 sons John, Henry, and William (my father).