Your Dewer's were not mentioned in this book. They have 3 listed, maybe they are of relation. A Peggy married John McArthur both of Bredalbane md. Feb 14, 1848.
Donald md Isabella Bethune both of Lochiel. Md March 26, 1835. Wit Alexander Meldrum and Duncan Campbell, of Lochiel.
Seen to Catherine McMillan, both of Lochiel. Md Jan 16, 1849. Wit john Dewer, and John Campbell, both of Lochiel.
Sorry I couldnt be of more help. Good luck