Mark:
I searched the subscription site Roots Ireland and located three baptismal records of interest although the father was shown as George Lee instead of Patrick Lee. See info below. I was not able to find a marriage record. Civil registration of deaths started in 1864. I searched but did not find a good lead for death records for George and Helen/Ellen.
Roger McDonnell
John Lee baptized February 11 1819 father George Lee mother Helen Mahony RC church Tallow
Michael Lee baptized October 11 1821 father George Lee mother Helen Mahony RC church Tallow
James Lee baptized October 3 1824 father George Lee mother Ellen Mahony RC church St. Mary's Clonmel