Hi,
The Tithe books show John Hart in Ballygibbon, Ballymackey and Modreeny.
These places are near to each other. The nearest town is Nenagh.
There is a birth record for Mary in 1824 born to a John Hart and Mary Evans.
The Parish is Roscrea (pronounced ross cray)
There are 3 other children
John b 7th Oct 1821
Owen b 1820 (this Eugene)
and a Pricilla b 1817
This may be them, I am not saying it is, but this is the closest by the Tithe books.
The Tithe books are from 1823 to 1837. Taxes paid.
Ok, Maggsie