Hi
I'm not related nor do I know Richard.
There is a listing in the White Pages phone book for a D Legard in Tasmania who may be a relative. It is the only Legard listed Australia wide so may be a relative.
If Patricia has not tried already the following link may be of help. I don't know if she can access his records but it is worth trying although if she knows he worked at so many farms, I am assuming she has some records unless Richard told her -
http://www.findandconnect.gov.au/guide/nsw/NE00505Where was he in 1967 when he last made contact and what other farms did he work on and in what states? All the information that his sister has will be of help.
Karin