Hi Araminta and thank you for responding to my query. I have searched the Tasmanian birth records and there is no birth record for any William Sullivan around 1839-1843. There is a marriage for a William Sullivan in April 1839 to Rachel Beckett, but no way of knowing if any connection exists. Very frustrating!!! I appreciate your help and if you or anyone can suggest what I can do next I'd love to hear it! I can't even establish when William (jnr.) arrived in SA through shipping records.