I know it's been years since you posted your message but I was wondering if you had ever found out any information about your husband's family. I ask because I was recently looking for information on the Richard Hazlett and Rosalie Potter as someone had requested a photo of their grave on the "Find a Grave" website for which I am a volunteer.
I did manage to find copies of their funeral notices and also the records of when they came to Australia with their son Richard and daughter Kathleen.
Anyway, if you get this message and your interested in this information let me know.
Regards, Jennifer :-)