I was able to get a copy of Elizabeth's death cert. Father is John Clark of the Chenail [Indian lands bordering Lake Francis, Dundee] and Katherine Summers or Somers of Ontario. The three Aubrey brothers married Clark sisters [Peter and Nancy, Nicholas and Elizabeth, and Joseph and Margaret - my grandparents]. They also had a brother David. b. 29 Jun 1830. Elizabeth's d.c. states born in Dundee, Quebec on 10 May 1819. Margaret was baptised 6 Aug 1809 in St. Andrew's, Williamstown, ON. Her parents are listed as John Clark and Katherine Somers - married 4 Oct 1808 at St. Andrew's. Katherine Somers was d/o Jacob Somers and Ann Cameron of Charlottenburg, ON, and was bap 20 Apr 1790. I think a lot of confusion came from Zion Burial records, which had the Clarks all mixed up, largely due to the fact they named all their children the same.