Wolff

I thought that Mrs. Wolff was Lorna Wolff and their children Diane and Louise.

Yes that is correct. She always used her 2nd name Lorna rather than what is on her birth certificate (Edith). My parents were married in 1947 and lived at the Yallourn Hotel while the house at 3 Allambee Crescent was being built. I was born in 1951 and my sister Louise, in 1957. We lived there until January 1966 when Dad (John Wolff) transferred to the SEC in Geelong.