G`day Greg, This is not what you were asking however it may be of some interest to you. My great,great,great Grandmother was called Eliza Deards. She was born at Allan River in 1868 and married Edward Elias LeCornu on the 9th of april 1890 in Dungog. They had at least five children.
I don`t know where Allan river is, perhaps you do. I would assume it would be near to Dungog. Surely there must be a direct relation here between Eliza and William Henry. Would you be aware of this lady Eliza? If you do I would be very greatful to hear from you.
I`m afraid this is the only info on Deards I know. Thankyou Greg and good luck with your search.