On 12 February 1870 (Ste. Anne, Calumet Island/l’Île du Grand Calumet, Pontiac Co., Québec) Thomas Brennan, son of Patrick Brennan and Matilda Shirley, married Susanna Connelly, daughter of John Connelly and Ellen Cahill. This couple then seems to disappear from the Canadian records. Did they emigrate to Leadville, Colorado?
The 1880 US federal census for Leadville, Lake, Colorado has a T.W. Brennan (age 37, born Canada), with wife Susan (age 33, born Canada), and children Shirley [male], Delacey, Mary, D. [?] and Margaret. The names Shirley and Delacey (here given as first names) are surnames found in the family trees of Thomas Brennan and Susanna Connelly, respectively.