Allen (sometimes Allan) MacDougall's (sometimes McDougall) wife was Mary (sometimes listed as Marie in Quebec documents) MacPherson (McPherson). She was born in Badenoch, Scotland. Allen was born on the Island of Jura.
I am having difficulty finding much further information on them however am confidant I will break through the "brickwall" since the MacPherson's of Badenoch were a rather prestigious family and so further records likely exist in Scotland.
I have reason to believe they are the same Allen McDougall and Mary McPherson who had a daughter name Margaret in 1791, born in Kilmore and Kilbride, Scotland and died young. Ultimately they settled in Sainte-Geneviève-de-Berthier, Quebec.
As for Suzette (sometimes Josette or Josephte) Laurin (could be Lorin or Delorme) her parents are unknown. As for her husband Alexander MacDonell (with numerous variations of spelling including the french form Alexandre and the last names MacDonald, MacDonnell, McDonell, etc) he was Alexander MacDonell of Greenfield. You can see his wiki page here: http://en.wikipedia.org/wiki/Alexander_Macdonell_of_Greenfie...
According to volume VII of the Généalgies des familles du Manitoba by Reverend Father Plourde Suzette's father, "Alexander (Greenfield) MacDonald" (and sometimes "Alex" was a "judge in the east" after he returned to live with his family in Cornwall leaving his wife and infant daughter behind.
Since Suzette was his "country" wife and he wasn't ever technically "legally" married the Burke's Landed Gentry lists him as o.s.p. (i.e. having died without issue) but of course this is because only "legitimate" issue was recognized at the time that Burke's Landed Gentry was published.
Good luck in your searches!
John M McDougall-Goulet