I also believe we are related. Edward Kavanaugh, born 1831, Co. Wexford, Ireland.Part of his family emigrated to Canada due to the "Potato Famine".However, 3 brothers, James, Daniel, and Loughlin Kavanaugh emigrated to America through the Port of New Orleans, LA circa 1847.
Daniel and Loughlin both married and settled in Jackson, Mississippi. Look in Hinds Co., MS on Find-A-Grave. Brother, James Kavanaugh, went "West" and ended up in Washington Territory.
Descendents of Edward DID wind up in the Dakotas. Some only went as far as Nebraska - This is ALL the same family!
It took almost 30 years to get these lines to come together.