Fraser-Kempt Marriage

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Looking for marriage of Duncan Fraser b <1781> Gairloch? & Mary Kempt born <1791> ? Believe  they lived  Gairloch, Ross & Cromarty??  I believe her father was William son of John   "Brick Wall ?? Info I have
 Their children: Ann b <1797> Gairloch, Annabel b<1799> Donald b<1801> Catherine m Robert Anderson 10 Jan 1850 Gairloch, Mary b<1812, Roderick b <1814> m Isabella Bain 1849 Boularderie, Nova Scotia.  She was the daughter of James & Margaret MacKedie Parish of Nigg.   Alexander b<1821>Margaret, Kenneth, Isobel.
According to sources someone gave me:  some of children stayed in Scotland  with parents while some came to Nova Scotia Canada.
Can anyone help me with this family especially marriage for parents. I really appreciate it. I can't get any farther.
Janet