My 2nd gr grandmother was the youngest of her family, having 8 siblings. Her parents, born in Ireland, immigrated to the states in 1848. I have recently found Wisconsin, USA census records that indicate her oldest sister, born 1845 and oldest brother, born 1846 were actually born in Canada. One record says her brother was born in Ontario. There was no indication as to where in Ontario I should start my search as I follow the path backwards to Ireland. I am wondering if someone knows a particular immigration flow for people leaving Ireland, travelling into Canada and then removing themselves, again, to the USA? If there was a pattern, then that would at least give me a place to start. Any other suggestions would be much appreciated.

See our Beginner's Guide to Ontario Genealogy and follow the suggestions regarding those born "somewhere" in Ontario.