THE foster mother and brother of Logan schoolgirl Tiahleigh Palmer will be sentenced in the Beenleigh District Court on July 27.
Julene Thorburn, 54, and son Josh, 20, have pleaded guilty to one count each of perjury and attempting to pervert the course of justice.
The date was set during a mention in the Beenleigh District Court on Thursday.
The duo are on bail and did not face court.
The body of 12-year-old Tiahleigh Palmer was found on the banks of the Pimpama River six days after she went missing.
Her foster father Rick Thorburn faces murder charges, while another foster brother, Trent, 19, has been charged with incest, perjury and attempting to pervert the course of justice.