William RICHARDSON was born 1810 in Brede, Sussex, England. He married Hannah FULLER in 1829 at Brede. In Oct 1837 they along with four children arrived in Sydney on the Augusta Jessie. Two more children were born in Sydney.
William was listed as a labourer and Stone cutter on the shipping list.
A number of trees on Ancestry have his death in 1876 as William John RICHARDSON, but there is no sign of him in the NSW BDMs either as William or William John, so have no idea where that information came from. No sign of Hannah's death either.
Some of the children moved north into southern Queensland so its possible William and Hannah moved that way as well.
A fresh pair of eyes might find something I can't.
Thanks
Ian C