My ggrandmother was Ellen HENNESSY, b. 1851 in Ireland and migrated to the US in 1860's or 70's. She married John HEALEY, probably in Worcester, MA and had five children, one of whom survived: Mary Ellen HEALEY. She married my grandfather, Frank A. BROWN, b. 1875, W. Brookfield MA.
I do not track any of the ancestors to the Michigan area, but Ellen HENNESSY may have had brothers who ended up there.