I see two Fitzsimons born to John and Isabella, but no Thomas. FITZSIMONS, Robert Birth Gender: Male Birth Date: 8 Apr 1866 Birthplace: 631, Strangford, Down, Ire Recorded in: Down, Ireland Collection: Civil Registration Father: John FITZSIMONS Mother: Isabella MAGEE Source: FHL Film 101125 Dates: 1866 - 1866 FITZSIMONS, Robert Birth Gender: Male Birth Date: 28 Apr 1869 Birthplace: 631, Strangford, Down, Ire Recorded in: Down, Ireland Collection: Civil Registration Father: John FITZSIMONS Mother: Isabella DENVIR Judy Source: FHL Film 101185 Dates: 1869 - 1870