Looking for Cusack S

timothy cusack was my 2x gr grandfather he arrived in tasmania in august 1852 from county clare after being sentenced to 7 years for killing a sheep, daughter elizabeth was my great grandmother, who married john windley, also decendant of a convict, their daughter charlotte was my grandmother who married wentworth irwin, my fathers father. any information regarding timothy, eg parents or siblings would be much appreciated.
sue irwin