Susan ann Le Tissier was my mums grandmother. She remembers her well.I was sent records from castel,guernsey church in the 1990's,regarding Susan's Grandfather- John(jean)Le Tissier snr and his ancestry(which differ from yours!),the aussie records you have are correct. The name was known as Le Tissier. I haven't got my notes onhand at present,but the reference to him being in Avoca Victoria (with his mother?) appear to be correct.A gazetted list at the time show that there were 2 unclaimed letters for John Thomas snr at the Avoca Post Office. regards-Chez.