Johnny O'Keefe was married twice, the first time to Marianne Renate Willinzik (hairdresser, m. 1958, div. 1966) then to Maureen Joan Maricic (fashion consultant, m. 1975). None of them were performers.
Marianne remarried but unfortunately recently succumbed to cancer. She is mother to Johnny Jnr., Victoria and Peter.
Here is photo of J.O'K, her and two of the children.
http://nla.gov.au/nla.pic-an24552914
To our knowledge, Maureen lives in Victoria.
J.O'K never trained anyone, but if any artists were on his show, he would insist they were professional and sometimes gave pointers to them of what to do at the time. If any artist needed 'training' as such, he would not perform with them.
Some artists were so in awe of him, they copied everything they could and in this way, they maybe some of them see that as being trained.