SIBLINGS of one of the men accused of murdering three people have spoken about their Mackay history.
Garry Reginald Dubois, 68, and Vincent O'Dempsey, 77, are accused of murdering Barbara McCulkin and her two daughters, Vicki, 13, and Leanne, 11, 41 years ago.
A committal hearing is being held in Brisbane this week for the cold case and Mr Dubois's brother and sister gave evidence yesterday.
They said their family lived in Mackay until their father died and they all moved to Brisbane with their mother in about 1960.
Gail Dubois, Mr Dubois's sister, told the court her murder-accused brother was probably about 11 years old when they moved.
She also told the court she lost regular contact with her brother when he went to jail as a young adult.
Mr Dubois's brother Paul also gave evidence on Monday and said his brother had told him he did not kill the McCulkins and that "Vincent O'Dempsey did it".
Paul Dubois said his brother had spoken to Mr O'Dempsey after the incident.
He told the court his brother had been told by Mr O'Dempsey that "the kids weren't meant to be there" and that Mr O'Dempsey wanted to kill Barbara because she had evidence on him that "would have got him around 20 years (in jail)".
Paul Dubois said he had not spoken to his brother for about 21 years and he did not tell anyone about what his brother had told him about the McCulkins.
"I just didn't want to talk about it ... the whole thing was disgusting ... I didn't talk to anybody about it," he said.
The court heard about 87 witnesses were involved in the case.
It is expected the committal hearing will continue until Friday and possibly next week.
Update your news preferences and get the latest news delivered to your inbox.