John Angus was actually a grandson of Big Angus Gillis and Isabella MacFarlane. There may have been other children of Angus and Isabella that have not been found yet but as far as records go none of their known children ever married. Hugh died a bachelor and the girls were all recorded as never being married on all census and death documents.
Big Angus was the son of Hugh Gillis from Judique and his wife Catherine MacDonald. Angus had a brother Donald who was married to Flora, Donald Red MacDonald of Judique