What other information do you have on Cassidy's in Chicago? I have very little genealogy information on my family, but my grandfather, Patrick Cassidy, settled in Chicago after marrying Catherine Burke in Pennsylvania. He and at least two brothers, one named Edward and I think one named Michael, are in photos that I have on his back porch/deck in Chicago. I can't find any of his siblings. They immigrated from Ireland sometime in the early 1900's.
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. My maiden name, by the way, is Margaret Cassidy.