Premier Annastacia Palaszczuk has called for an investigation into the reported prison bashing of Tiahleigh Palmer's foster brother.
Trent Thorburn, 19, has been in the Arthur Gorrie Correctional Centre since last week after he was arrested on charges of incest, attempting to pervert the course of justice and perjury.
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Foster brother 'betrayed her trust'
Tiahleigh Palmer allegedy told a friend Trent Thorburn "tried to touch me", two months before she was killed. Nine News
The Beenleigh Magistrates Court last week heard Thorburn told a cousin over Facebook he had sex with the 12-year-old schoolgirl and was worried she might have been pregnant.
News Corp reports Thorburn was set upon by other prisoners in two separate incidents over the weekend, during which he was taunted with shouts of "pretty boy" and "kill him".
He received minor injuries.
"That's a matter for the Department of Corrective Services," Ms Palaszczuk said on Monday.
"I would absolutely assume that there will be an investigation into those issues that have been raised."
Thorburn's father Rick, 56, has been charged with Tiahleigh's murder and is also in prison awaiting his next court appearance in December.
His partner Julene, 54, and his other son Josh, 20, were granted bail on charges of perjury and attempting to pervert the course of justice.
Police officers have remained at their Chambers Flat acreage since last week digging for evidence linked to Tiahleigh's death.
Her school backpack and uniform have never been recovered since her body was found on the banks of the Pimpama River last October.
AAP