It is amazing how much information can be gained from newspaper family notices, and in particular funeral notices.
Here is an example from Trove in the Sydney Morning Herald of Tuesday 27 November 1900, on page 10:
I had been searching for the death of one Mary Nugent. What I can learn about this family from these three notices is that this Mary Nugent was the wife of Mr P. Nugent (perhaps Patrick?). They lived at 57 Balmain Road, Leichhardt, and their (surviving) children were James, Francis, Alfred, William and George. They also had a daughter, Mary, who married William Beardmore.
This is a lot of information about one family, and is especially useful where the surname is relatively common, such that a search in the NSW BDM indexes is inconclusive. It is even more useful if the children had been born after the 100 year cutoff for the NSW Birth Index (currently 1911), where I might otherwise have had to order a copy of the death registration to see who her children were.
Unfortunately this isn’t the Mary Nugent I was looking for, as she was a widow. If she had remarried, and she may have, her surname would be different. At least there is enough evidence in these funeral notices for me to discount this Mary without any further searching. And what a bonus it would have been if she was the Mary I was searching for!