Have requested Curious Fox to do an email address check to see if the address they had in 2006 is still a valid one. Told this could take some time.
There is a sparse tree on ancestry which shows Frederick married in 1962 Woollongong, NSW, Australia and had 4 children (2 sons, 2 daughters) - no details of them as all still living. By at least 1969 he had moved to Otago, New Zealand where he died 4/7/1989.
There is nothing to say that the person who posted on Curious Fox was male so could have been any one of his 4 children.
Annette