My children's ancestor was Patrick H. Breen, born on March 03, 1843, in Ballingford in County Kerry, Ireland, and died June 13, 1907, in Vail, Iowa. He maried Maria Whalen, born on September 28, 1847, in Killimor County in Galway, Ireland. I knew their son Charles Edward Breen, born 1880 in Illinois; Charles was my grandfather-in-law. One of Charles' sisters was a nun in the order of St. Francis in Clinton, Iowa.
Patrick Breen's second wife was sister to Maria Whalen; this second wife was named Kate Whalen, born 1853 in Ireland. The Church allowed this marriage, probably because many Breen children were motherless.
Very interesting family.