The brother of an Australian baby girl, believed taken by a dingo almost 30 years ago in a case turned into a Hollywood film, has married in a ceremony which used the family car once tested for traces of her blood.

Azaria Chamberlain disappeared 28 years ago on a family camping holiday to Ayers Rock, now known as Uluru. Her mother Lindy was jailed on murder charges and later freed, despite saying the 9-week-old was taken by a native dog.

Azaria's brother Aidan, 34, aged just six when his sister vanished in 1980, was chauffeured from his wedding ceremony in the car forensically-tested for the baby's blood. No blood was found and the Australian-build sedan now has the licence plate 4ENSIC.

"I'm proud they drove it in their wedding because it not only put someone in jail, it saved them and took them out of jail again," Azaria's father Michael told New Idea magazine.

Lindy Chamberlain was tried and convicted of the baby's murder in 1982 and jailed for life. Michael Chamberlain received a suspended sentence for being an accessory to the murder amid international headlines. Both were later exonerated.

The story of the disappearance was made into a movie starring Meryl Streep, called A Cry in the Dark, as well as an opera.

Lindy Chamberlain told the magazine her son carried a lot of anger after being linked occasionally in media reports to Azaria's disappearance. "He has the softest heart of all three of my kids," she said.