Hi Nerida,

Welcome to RootsChat

As you probably know, publically available death records in Queensland are only available to 1985 and are closed for 30 years, so if his death occurred after 1985 you will not be permitted to purchase a copy of the cert until 30 years after the death year.
If you know where he was living in later life then you would need to check with the cemeteries in the area. I have looked at Moreton Bay, Brisbane and the Mt Thompson crematorium without success. Phyllis died in 1979 in the Brisbane area, do you know where she was buried/cremated?
If he was still supporting his children when he enlisted they should be recorded on his enlistment papers in 1940.
Hopefully someone in the family will come across your post and be able to help. If Frank's two children are still living you will need to delete their names from your post as it is against RootsChat policy to discuss living people.
Debra
