So you are considering the following marriage ...
211/1835
V1835 211 129
George MULHALL married Mary A SMITH, district displayed as LD. LD is the code for a marriage record found in the parish registers for St Mary's Cathedral, Sydney, and is for Roman Catholic marriages. He would perhaps be the famous Mossman's Jack, a rower, on Sydney Harbour.
Have you checked NSW BDM online index to consider if Mary MULHALL's death registration has parents names displayed there.... if they do, perhaps it would be worthwhile for you to consider seeking her death cert, as your Joseph LEWIS should be listed as her son there for your thoughts to have some independent documentary support.
ADD, the 1830 Charles LEWIS marriage is indexed as CJ, ie Church of England, St James, Sydney.
JM