Hi Jan
Sorry to disappoint but it's not that straighforward.
GV as a source of thinking where your family originated is your main stumbling point ~
1. YOUR Jeffrey SR quite possible died before it was taken in the late 1850's / early 1860's and so obviously wouldn't show on it.
2. GV is NOT a census, it's a list of those heads of household whom were responsible for paying rents due on land and houses ~ there are a vast array of people who don't fall into this bracket and hence don't show up on the GV.
You also need to take 'Limerick' into consideration.
Just because Jeffrey was born there, doesn't mean that it's where his parent's were from OR lived.
For example, say his father was a military man, travelling salesman, sailor etc ~ the family could have been transient and hence other baptisms could show up anywhere.
Sorry but there is more work for you to do in NSW.
To research family in Ireland you need father's name, mother's name (including maiden name), you then need an EXACT parish, not just county that they came from to see if records for that area still exist.
You need to go back to where your Jeffrey lived and died in NSW.
You need to trawl births, marriages and deaths to try and get leads.
You need to look through newspapers for obits and the like to see if a townland for him is mentioned.
You need to tray and track possible siblings for him in the area and do the same for them, try to get any leads to a townland that your family originated in.
So, a quick question ~
Was an occupation for Jeffrey SR ever mentioned ?
Jeffrey JR being an apothecary ~ did he train here or in NSW ?
Have you tried trade books in NSW to see if he's mentioned ~ again to try and get leads ?
Again Sorry, but more work to be done
Tara