None of Marion's siblings moved out of Alva.Her brother was my great great great grandfather. Marion's widowed mother had 2 illegitimate children(by different fathers) living with them in 1841. I don't know about William Mcintyre's family. Someone very kindly checked the cemetery records for Kincardine cemetery" McIntyre, Mrs. Marion, Kincardine, D. April 30 1877, 54 years, native of Moa(!), Sterlingshire, Scotland, emigrated to America May 31 1843, wife of William McIntyre. B1. A. , lot 30". Wouldn't it have said Canada if that was where they emigrated to?. I wonder if that forum post in 1999 got it the wrong way round and they started out in Buffalo and then moved to Canada.
Maybe I'm looking in the wrong country's census records!
Elisabeth