Hi Julie,
I don't think the Patrick HEFFERNAN who died in 1912 is yours. There was no mention of wife or de facto or any children and a vague mention of a gratuity from a brother (unnamed). However the will was made shortly before his death while he was in hospital and he left everything to the nurse (Sister Mary) who was caring for him. I did photograph it in case I missed something.
Interestingly (from the point of view of NSW research) the deceased estate which MAJM directed us to was missing - in fact all the deceased estates which had paid duty in February 1913 were missing. The lady on staff did ask them to check in the bins either side but yes they were missing. She then asked if I had checked for a probate packet and I said there was no mention online. No there wouldn't be she said as
none of the probate packets from 1890 to 1928 are indexed online and need to check the microfiche index. This I did and found a probate reference and retrieved the probate packet. I hadn't realised that there was this huge gap in online index before.

(But yes it says so in heading if you read it properly)
I also expressed my surprise that there was both a deceased estate (potentially

) and probate packet available as I thought it was one or the other. The lady confirmed that probate packets contain a will and possibly death certs etc as well as the same info as in deceased estates (valuations) so they don't bother to keep deceased estates if there is a probate packet these days. But in the early days they kept both.
I learnt a lot today
But sadly not much help to you

cheers,
Ros