The father of two Queensland sisters who died after being allegedly left in a sweltering vehicle by their mother says he wants to "expose the truth".
The man, who wishes to remain anonymous, told 7 News the circumstances surrounding the deaths of one-year-old Chloe-Ann and two-year-old Darcey-Helen should be made public.
"I want a full public inquiry into the deaths of my girls," said the man, who is the biological father of one but views himself as a dad to both sisters.
"I want those responsible for the inaction... to be held accountable. I want to expose the truth. The community has a right to know."
The sisters died inside a black station wagon parked outside the family property in Logan, south of Brisbane, on Saturday afternoon. The outside temperature in the area had surpassed 30C and the girls showed evidence of extreme heat exposure upon discovery.
Their 27-year-old mother, Kerri-Ann Conley, was charged with two counts of murder on Sunday. She has also been charged with possession of dangerous drugs and drug utensils, 7 News reports.
Multiple people close to the family have since claimed they alerted authorities out of concern for Chloe-Ann and Darcey-Helen's welfare.
On Monday, Queensland premier Annastacia Palaszczuk confirmed the family was known to the state's child safety department, which had contacted them in the past.
Palaszczuk said she would release the findings from an investigation into the family's history with the department.
State opposition leader Deb Frecklington has since announced her support for a Government overhaul of the child safety system.
Conley did not appear in Brisbane Magistrates Court on Monday.
