It is possible that Patrick's wife was deceased when he immigrated to America circa 1830, or she died shortly thereafter. I have no clear date of when Patrick immigrated; 1830 is simply a guess based on when he was naturalized (1837). I have nbot been able to find immigration records for anyone in his family.
Patrick's name first appears on the 1840 Conemaugh Township, Cambria County, Pennsylvania (US) census. He would have been listed as age 20-49; three females, all under age 19, were listed in the household, as were two males, aged 5-14. It was in later censuses that Patrick's year of birth is determined to be in the 1790s.
Patrick and his daughter (?) Bridget were listed on the 1850 and 1860 Conemaugh Township censuses. Bridget is listed as having been born in Pennsylvania; she is listed as 20 years of age in1850 and 22 years of age in 1860.
I could find no census or other records for Patrick of Bridget after 1860. Bridget Brophy, however, was a godparent for my great grandmother in 1860, and a "B. Brophy," likely identical to Bridget, was a witness at my g-gm's wedding in 1888.
The Patrick Brophy who married Margaret Fogarty might not be identical to my ancestor, as her name does not appear in the 1850 or 1860 censuses with Patrick, and she likely is not included on the 1840 census.
It is, of course, possible that Patrick and his family were in Pennsylvania in 1830 but not in Conemaugh Township. Bridget could then have been born in Pennsylvania and her mother died before the 1840 census.