His father Maurice was a commercial traveller, and his mother was Bessie (née Hart).
Maurice was working as a canteen manager on HMAS Sydney (D48), and died when the ship was sunk in 1941.
[1] Opas married Kristin Mary Bisset (née Deck), a 29-year-old divorced assistant-pharmacist, on 17 December 1970 in Sydney.
[1] Opas was appointed as a judge to the Family Court of Australia on 27 October 1977.
[1] On 29 July 2015 68-year-old Leonard John Warwick was arrested by detectives at Campbelltown, New South Wales over the shooting murder of Opas, bomb death of Pearl Watson, wife of Judge Ray Watson, two other murders, one by gunshot, and bomb attacks from 1980 to 1985, all related to the Family Court of Australia.