Family search has the following children listed :-
Mary Mcgill, Birth Date: 4th Aug 1784
Jean Mcgill Birth Date: 19th July 1788
Archibald Mcgill, Birth Date: 5th Apr 1790
Marrion Mcgill : Baptism/Christening Date:7th Jan 1792
Margaret Mcgill : Baptism/Christening Date: 20 Nov 1793
John Mcgill Baptism/Christening Date: 4th Mar 1807
All events recorded in KILLEAN AND KILCHENZIE,ARGYLL,SCOTLAND and parents listed as Barbara (or Barbra) Stewart (or Stuart) and Neil (or Niell) McGill (or Mcgill)