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Also note that the LDS Family search site shows that Alexander Erwin had a son, Marcus, born 1811, mother Winona (Sarah Robinson, his first wife, died young, as I recall). 1811 is pretty close to 1813, in the world of genealogical mistakes, and the information came from a descendent, not a primary sources, so there is room for error. Hope this turns out to be a lead, good luck, Kate