Some years ago (early 1990s I think) I was in touch with David (born 1952) and Cindy Cree in Tasmania. David is a son of the Campbell Cree you mention (born 1918) and his wife Inez (Turner) Cree. Yes Campbell is a son of John Campbell Cree (1888-1961) and Irene Gladys Grimson (1895-1950) so it all matches, though I know nothing of the scandal. Please tell!
Their ancestry goes back to James Cree and Christian Graeme who were married in 1770 in Auchterarder, Perthshire, Scotland. James was a waucher. We also know Christian was a daughter of David Graham and Christian Carrick.
See
www.cree.name/person.htm?id=2790 and work back in time clicking on the father (gold lettering) in each generation.