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Tia Palmer's foster brother denied bail

AAP logoAAP 21/12/2016 Sarah Motherwell

Queensland schoolgirl Tiahleigh Palmer may not have been the first underage girl her foster brother Trent Thorburn had a relationship with, a court has heard.

He has been in custody for about three months since being charged with having an incestuous relationship with the 12-year-old before her death in October 2015.

He is also alleged to have lied to secret Corruption and Crime Commission hearings investigating Tiahleigh's suspected murder.

The 19-year-old was denied bail in the Brisbane Supreme Court on Wednesday on the grounds he could interfere with witnesses in the case and fail to appear at court in the future.

Justice John Bond said police were also concerned that Trent would reoffend if released from custody as they believed his alleged relationship with Tiahleigh was not the first occasion he had been with an underage girl.

Police allege Trent had sex with Tiahleigh at the family's Chambers Flats home, south of Brisbane, on or about September 26, 2015.

The court heard the revelation of their relationship was what allegedly instigated foster father Richard Thorburn to kill her a month later.

The 56-year-old allegedly claimed he dropped Tiahleigh off at Marsden State High School on the morning of October 30, 2015 - six days before her body was found on the banks of the Pimpama River.

Richard was charged with murder in September and did not appear in Beenleigh Magistrates Court when his case was mentioned, along with Trent's, on Wednesday.

The court heard Richard would undergo a psychiatric evaluation before his next appearance with Trent via video link on February 22.

Tiahleigh's biological mother Cindy Palmer attended both courts in Brisbane and Beenleigh, flanked by supporters dressed in purple, her daughter's favourite colour.

Outside Brisbane's Supreme Court, Ms Palmer said she was "relieved" Trent would remain in custody.

"It's quite raw - it still brings me to tear every time I hear something, I'm just lucky I have support," Ms Palmer said.

"It's important that I come (to court) because I look for information, any bit of information I can get about what's happened just to make sure justice will prevail for Tiahleigh."

Foster mother Julene Thorburn, 54, and other son Josh, 20, last month pleaded guilty to perjury and attempting to pervert the court of justice in Beenleigh Magistrates Court.

The Supreme Court heard Trent was not the instigator in the family's alleged attempt to cover up what happened to Tiahleigh but was an "enthusiastic participant".

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